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In the previous exercises, you have already learned about the two conic sections called 'circle' and 'parabola'. In the NCERT solutions for Class 11 Maths chapter 11 exercise 11.3, you will learn about another conic section called 'Ellipse'. An ellipse is the set of all points in a plane, the sum of whose distances from two fixed points in the plane is a constant. There are two axes of the ellipse called the major axis and minor axis. In the Class 11 Maths chapter 11 exercise 11.3, you will also learn about the semi-minor axis, semi-major axis, and the relationship between the semi-minor axis and semi-major axis.
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Some special cases of an ellipse, the eccentricity of an ellipse, standard equations of an ellipse, the latus rectum of an ellipse are also covered in the Class 11 Maths chapter 11 exercise 11.3 solutions. Many real-world situations like orbits of planets, orbits of satellites, orbits of moons, some airplane wings are represented by an ellipse. It has a lot of applications in the field of science, research, and design. There are some definitions, theories, and observations related to the ellipse is given in the NCERT textbook before this exercise. You must go through these theories in order to get conceptual clarity. In the Class 11th Maths chapter 11 exercise 11.3, you will learn about the mathematical applications of an ellipse. Also, you can check NCERT Solutions link if you are looking for NCERT solutions at one place.
Also, see
Answer:
Given
The equation of the ellipse
As we can see from the equation, the major axis is along X-axis and the minor axis is along Y-axis.
On comparing the given equation with the standard equation of an ellipse, which is
We get
and .
So,
Hence,
Coordinates of the foci:
The vertices:
The length of the major axis:
The length of minor axis:
The eccentricity :
The length of the latus rectum:
Answer:
Given
The equation of the ellipse
As we can see from the equation, the major axis is along Y-axis and the minor axis is along X-axis.
On comparing the given equation with the standard equation of such ellipse, which is
We get
and .
So,
Hence,
Coordinates of the foci:
The vertices:
The length of the major axis:
The length of minor axis:
The eccentricity :
The length of the latus rectum:
Answer:
Given
The equation of the ellipse
As we can see from the equation, the major axis is along X-axis and the minor axis is along Y-axis.
On comparing the given equation with the standard equation of an ellipse, which is
We get
and .
So,
Hence,
Coordinates of the foci:
The vertices:
The length of the major axis:
The length of minor axis:
The eccentricity :
The length of the latus rectum:
Answer:
Given
The equation of the ellipse
As we can see from the equation, the major axis is along Y-axis and the minor axis is along X-axis.
On comparing the given equation with the standard equation of such ellipse, which is
We get
and .
So,
Hence,
Coordinates of the foci:
The vertices:
The length of the major axis:
The length of minor axis:
The eccentricity :
The length of the latus rectum:
Answer:
Given
The equation of ellipse
As we can see from the equation, the major axis is along X-axis and the minor axis is along Y-axis.
On comparing the given equation with standard equation of ellipse, which is
We get
and .
So,
Hence,
Coordinates of the foci:
The vertices:
The length of major axis:
The length of minor axis:
The eccentricity :
The length of the latus rectum:
Answer:
Given
The equation of the ellipse
As we can see from the equation, the major axis is along Y-axis and the minor axis is along X-axis.
On comparing the given equation with the standard equation of such ellipse, which is
We get
and .
So,
Hence,
Coordinates of the foci:
The vertices:
The length of the major axis:
The length of minor axis:
The eccentricity :
The length of the latus rectum:
Answer:
Given
The equation of the ellipse
As we can see from the equation, the major axis is along Y-axis and the minor axis is along X-axis.
On comparing the given equation with the standard equation of such ellipse, which is
We get
and .
So,
Hence,
Coordinates of the foci:
The vertices:
The length of the major axis:
The length of minor axis:
The eccentricity :
The length of the latus rectum:
Answer:
Given
The equation of the ellipse
As we can see from the equation, the major axis is along Y-axis and the minor axis is along X-axis.
On comparing the given equation with the standard equation of such ellipse, which is
We get
and .
So,
Hence,
Coordinates of the foci:
The vertices:
The length of the major axis:
The length of minor axis:
The eccentricity :
The length of the latus rectum:
Answer:
Given
The equation of the ellipse
As we can see from the equation, the major axis is along X-axis and the minor axis is along Y-axis.
On comparing the given equation with the standard equation of an ellipse, which is
We get
and .
So,
Hence,
Coordinates of the foci:
The vertices:
The length of the major axis:
The length of minor axis:
The eccentricity :
The length of the latus rectum:
Question:10 Find the equation for the ellipse that satisfies the given conditions:
Vertices (± 5, 0), foci (± 4, 0)
Answer:
Given, In an ellipse,
Vertices (± 5, 0), foci (± 4, 0)
Here Vertices and focus of the ellipse are in X-axis so the major axis of this ellipse will be X-axis.
Therefore, the equation of the ellipse will be of the form:
Where and are the length of the semimajor axis and semiminor axis respectively.
So on comparing standard parameters( vertices and foci) with the given one, we get
and
Now, As we know the relation,
Hence, The Equation of the ellipse will be :
Which is
.
Question:11 Find the equation for the ellipse that satisfies the given conditions:
Vertices (0, ± 13), foci (0, ± 5)
Answer:
Given, In an ellipse,
Vertices (0, ± 13), foci (0, ± 5)
Here Vertices and focus of the ellipse are in Y-axis so the major axis of this ellipse will be Y-axis.
Therefore, the equation of the ellipse will be of the form:
Where and are the length of the semimajor axis and semiminor axis respectively.
So on comparing standard parameters( vertices and foci) with the given one, we get
and
Now, As we know the relation,
Hence, The Equation of the ellipse will be :
Which is
.
Question:12 Find the equation for the ellipse that satisfies the given conditions:
Vertices (± 6, 0), foci (± 4, 0)
Answer:
Given, In an ellipse,
Vertices (± 6, 0), foci (± 4, 0)
Here Vertices and focus of the ellipse are in X-axis so the major axis of this ellipse will be X-axis.
Therefore, the equation of the ellipse will be of the form:
Where and are the length of the semimajor axis and semiminor axis respectively.
So on comparing standard parameters( vertices and foci) with the given one, we get
and
Now, As we know the relation,
Hence, The Equation of the ellipse will be :
Which is
.
Question:13 Find the equation for the ellipse that satisfies the given conditions:
Ends of major axis (± 3, 0), ends of minor axis (0, ± 2)
Answer:
Given, In an ellipse,
Ends of the major axis (± 3, 0), ends of minor axis (0, ± 2)
Here, the major axis of this ellipse will be X-axis.
Therefore, the equation of the ellipse will be of the form:
Where and are the length of the semimajor axis and semiminor axis respectively.
So on comparing standard parameters( ends of the major and minor axis ) with the given one, we get
and
Hence, The Equation of the ellipse will be :
Which is
.
Question:14 Find the equation for the ellipse that satisfies the given conditions:
Ends of major axis (0, ± ), ends of minor axis (± 1, 0)
Answer:
Given, In an ellipse,
Ends of the major axis (0, ± ), ends of minor axis (± 1, 0)
Here, the major axis of this ellipse will be Y-axis.
Therefore, the equation of the ellipse will be of the form:
Where and are the length of the semimajor axis and semiminor axis respectively.
So on comparing standard parameters( ends of the major and minor axis ) with the given one, we get
and
Hence, The Equation of the ellipse will be :
Which is
.
Question:15 Find the equation for the ellipse that satisfies the given conditions:
Length of major axis 26, foci (± 5, 0)
Answer:
Given, In an ellipse,
Length of major axis 26, foci (± 5, 0)
Here, the focus of the ellipse is in X-axis so the major axis of this ellipse will be X-axis.
Therefore, the equation of the ellipse will be of the form:
Where and are the length of the semimajor axis and semiminor axis respectively.
So on comparing standard parameters( Length of semimajor axis and foci) with the given one, we get
and
Now, As we know the relation,
Hence, The Equation of the ellipse will be :
Which is
.
Question:16 Find the equation for the ellipse that satisfies the given conditions:
Length of minor axis 16, foci (0, ± 6).
Answer:
Given, In an ellipse,
Length of minor axis 16, foci (0, ± 6).
Here, the focus of the ellipse is on the Y-axis so the major axis of this ellipse will be Y-axis.
Therefore, the equation of the ellipse will be of the form:
Where and are the length of the semimajor axis and semiminor axis respectively.
So on comparing standard parameters( length of semi-minor axis and foci) with the given one, we get
and
Now, As we know the relation,
Hence, The Equation of the ellipse will be :
Which is
.
Question:17 Find the equation for the ellipse that satisfies the given conditions:
Foci (± 3, 0), a = 4
Answer:
Given, In an ellipse,
V Foci (± 3, 0), a = 4
Here foci of the ellipse are in X-axis so the major axis of this ellipse will be X-axis.
Therefore, the equation of the ellipse will be of the form:
Where and are the length of the semimajor axis and semiminor axis respectively.
So on comparing standard parameters( vertices and foci) with the given one, we get
and
Now, As we know the relation,
Hence, The Equation of the ellipse will be :
Which is
.
Question:18 Find the equation for the ellipse that satisfies the given conditions:
b = 3, c = 4, centre at the origin; foci on the x axis.
Answer:
Given,In an ellipse,
b = 3, c = 4, centre at the origin; foci on the x axis.
Here foci of the ellipse are in X-axis so the major axis of this ellipse will be X-axis.
Therefore, the equation of the ellipse will be of the form:
Where and are the length of the semimajor axis and semiminor axis respectively.
Also Given,
and
Now, As we know the relation,
Hence, The Equation of the ellipse will be :
Which is
.
Question:19 Find the equation for the ellipse that satisfies the given conditions:
Centre at (0,0), major axis on the y-axis and passes through the points (3, 2) and (1,6).
Answer:
Given,in an ellipse
Centre at (0,0), major axis on the y-axis and passes through the points (3, 2) and (1,6).
Since, The major axis of this ellipse is on the Y-axis, the equation of the ellipse will be of the form:
Where and are the length of the semimajor axis and semiminor axis respectively.
Now since the ellipse passes through points,(3, 2)
since the ellipse also passes through points,(1, 6).
On solving these two equation we get
and
Thus, The equation of the ellipse will be
.
Question:20 Find the equation for the ellipse that satisfies the given conditions:
Major axis on the x-axis and passes through the points (4,3) and (6,2).
Answer:
Given, in an ellipse
Major axis on the x-axis and passes through the points (4,3) and (6,2).
Since The major axis of this ellipse is on the X-axis, the equation of the ellipse will be of the form:
Where and are the length of the semimajor axis and semiminor axis respectively.
Now since the ellipse passes through the point,(4,3)
since the ellipse also passes through the point (6,2).
On solving this two equation we get
and
Thus, The equation of the ellipse will be
Class 11 Maths chapter 11 exercise 11.3 consists of questions related to finding the coordinates of the foci of an ellipse, the vertices of an ellipse, the length of the major axis and minor axis of an ellipse, the eccentricity and the length of the latus rectum of an ellipse given the equation of an ellipse. Also, you will learn to write the equation of the ellipse when the other parameters of the ellipse are given.
Also Read| Conic Section Class 11 Notes
Happy learning!!!
The set of all points in a plane, the sum of whose distances from two fixed points in the plane is a constant is called an ellipse.
The centre of the ellipse is the mid-point of the line segment joining the foci.
The major axis of an ellipse is a line segment passing through the foci of the ellipse.
The minor axis of an ellipse is a line segment passing through the centre and perpendicular to the major axis.
The Latus rectum of an ellipse is a line segment passing through the foci and perpendicular to the major axis whose endpoints lie on the ellipse.
The whole coordinate geometry unit has 10 marks weightage in the CBSE Class 11 Maths final exam.
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