Question

write the new coordinates after the triangle is rotated 180 degrees counterclockwise about the origin.

Answer 1

For the new coordinates of point A, that is A' = (x', y'), we have:

x' = 2 . cos (180º) = 2 . (-1) = -2

y' = 10 . cos (180º) = -10

The same happens to the other points. So, for B we have :

x' = 3 . (-1) = -3

y' = -4 . (-1) = 4

And for C:

x' = -3 . (-1) = 3

y' = 1 . (-1) = -1

Therefore, the new coordinates will be:

A'(-2, -10)

B'(-3, 4)

C'(3, -1)