Which is the image of mc048-2.jpgabc for a 180° counterclockwise rotation about p?

1. Check the picture

 2. Each of the points A, B, C is projected with respect to point P, at A', B' and C' respectively.

3. For example we denote A', at the extension of AP, such that AP=PA'

Similarly with the other 2 points. Then we join A', B', C'

triangle GHI