Question

What is the image of A(8,2) under R90 ?

A. (-2,8)
B. (2,8)
C.( 8,-2)
D.(-8,2)

Answer 1

Answer: A. (-2,8)

Explanation:

We know that the rule for rotation of
`R_(90)` is given by :-

`(x,y)\rightarrow(-y,x)`, where (x,y) is the point of pre-image and (-y,x) is a point of image.

The given point of pre-image : A(8,2)

Then after rotation of
`R_(90)`, we have the image point as :-

`(8,2)\rightarrow(-2,8)`

Hence, the image point of A(8,2) is (-2,8) .