Question
When a point (a, b) is rotated 180 counterclockwise about the origin, then the coordinates of the image point will be________
- (a, b) → (-b, a)
- (a, b) → (-a, -b)
- (a, b) → (b, -a)
- (a, b) → (a, b)
Hint:
General rotation of the point at 180 degrees angle of rotation.
The correct answer is: (a, b) → (-a, -b)
* In Mathematics, rotation means the Circular movement of an object around one fixed point.
* In rotation, the image after transformation remains constant.
* Hence, it is called as a rigid transformation.
* No Change in shape and size.
* The Shape rotates counter- clockwise when the degrees is positive and rotates clockwise when degrees is negative.
*The Rotation of a point (x, y) about origin and through angle alpha, then:
New coordinates of a point (x, y) after it's rotation becomes (x cos
- y sin , y cos + x sin)
>>>Given That:
When a point (a, b) is rotated 180 counterclockwise about the origin, then the coordinates of the image point will be________
>>>The new coordinates are:
= (a cos - b sin , b cos + a sin)
= (a cos180 - b sin180 , b cos180 + a sin180)
= (-a,-b).
>>>Therefore (a, b) -> (-a, -b).
Rotate the point in the plane at 180 degrees of angle of rotation to obtain the point of rotation.
Related Questions to study
When a point (a, b) is rotated 90 counterclockwise about the origin, then the coordinates of the image point will be________.
When a point (a, b) is rotated 90 counterclockwise about the origin, then the coordinates of the image point will be (-b, a).
When a point (a, b) is rotated 90 counterclockwise about the origin, then the coordinates of the image point will be________.
When a point (a, b) is rotated 90 counterclockwise about the origin, then the coordinates of the image point will be (-b, a).
Rotation can be clockwise or __________________.
Therefore, we can say that the Rotation can be done both in clockwise or counter clockwise direction.
Rotation can be clockwise or __________________.
Therefore, we can say that the Rotation can be done both in clockwise or counter clockwise direction.
Rays drawn from the center of rotation to a point and their image form the __________ of rotation.
The angle of rotation is nothing but the angle between the line that joins center of rotation to the real point and the line that joins the center of rotation and the image point.
Rays drawn from the center of rotation to a point and their image form the __________ of rotation.
The angle of rotation is nothing but the angle between the line that joins center of rotation to the real point and the line that joins the center of rotation and the image point.
It is a transformation in which a figure is rotated around a fixed point called__________.
>>>>The center of rotation is the point that rotates the given figure about a point.
It is a transformation in which a figure is rotated around a fixed point called__________.
>>>>The center of rotation is the point that rotates the given figure about a point.
Use matrix multiplication to find the image. Graph the polygon and its image.
Reflect 
in the y-axis.
The required matrix representation is:
Use matrix multiplication to find the image. Graph the polygon and its image.
Reflect in the y-axis.
The required matrix representation is:
Use matrix multiplication to find the image. Graph the polygon and its image.
Reflect in the x-axis.
Therefore, the required matrix is:
Use matrix multiplication to find the image. Graph the polygon and its image.
Reflect in the x-axis.
Therefore, the required matrix is:
Find point C on the x-axis, so AC + BC is a minimum.
A(-2, 3), B (5, -3)
Find point C on the x-axis, so AC + BC is a minimum.
A(-2, 3), B (5, -3)
Find point C on the x-axis, so AC + BC is minimum.
A(3, 4), B (-3, 6)
¶
- ¶
- Coordinate Geometry: This is one of The branches of geometry in which a point's position is defined using coordinates. ¶
- Coordinates: Coordinates are a set of values that help to determine the exact location of a point in the coordinate plane. ¶
- Coordinate Plane: The two-dimensional plane formed by intersecting two perpendicular lines, the x-axis, and y-axis, is known as Coordinate Plane. ¶
- Distance Formula: The distance is used to calculate the length between two points in A(x1,y1) and B(x2,y2). ¶
- Section Formula: It is used to divide any line into two parts in an m:n ratio. ¶
- Mid-Point Theorem: Mid-Point Theorem formula determines the coordinates at which a line is divided into two halves. ¶
Find point C on the x-axis, so AC + BC is minimum.
A(3, 4), B (-3, 6)
¶
- ¶
- Coordinate Geometry: This is one of The branches of geometry in which a point's position is defined using coordinates. ¶
- Coordinates: Coordinates are a set of values that help to determine the exact location of a point in the coordinate plane. ¶
- Coordinate Plane: The two-dimensional plane formed by intersecting two perpendicular lines, the x-axis, and y-axis, is known as Coordinate Plane. ¶
- Distance Formula: The distance is used to calculate the length between two points in A(x1,y1) and B(x2,y2). ¶
- Section Formula: It is used to divide any line into two parts in an m:n ratio. ¶
- Mid-Point Theorem: Mid-Point Theorem formula determines the coordinates at which a line is divided into two halves. ¶
What is the line of reflection for 
and its image?
From the graph, the line of reflection is x-axis.
What is the line of reflection for and its image?
From the graph, the line of reflection is x-axis.
What is the line of reflection for and its image?
From the graph, the line of reflection is y = x.
What is the line of reflection for and its image?
From the graph, the line of reflection is y = x.
The matrix 
show the reflection in
The reflection matrix in the x-axis =
The matrix show the reflection in
The reflection matrix in the x-axis =
The matrix 
show the reflection in
* The reflection matrix in the y-axis =
The matrix show the reflection in
* The reflection matrix in the y-axis =
Write the matrix for the polygon.
The required matrix is:
Write the matrix for the polygon.
The required matrix is:
Write the matrix for the polygon.
The required matrix is:
Write the matrix for the polygon.
The required matrix is:
Use matrix multiplication to find the image. Graph the polygon and its image.
Reflect 
in the y-axis.
The required matrix for the image is:
Use matrix multiplication to find the image. Graph the polygon and its image.
Reflect in the y-axis.
The required matrix for the image is:
