# A line segment with endpoints at #(-1 , -9)# and #(3, -5 )# is rotated clockwise by #pi/2#. What are the new endpoints of the line segment?

##### 1 Answer

Jun 24, 2016

#### Explanation:

I am assuming this a rotation about the origin.

Under a clockwise rotation about the origin of

#pi/2# a point (x ,y) → (y ,-x)

hence (-1 ,-9) → (-9 ,1) and (3 ,-5) → (-5 ,-3)