Question

Which rotation rule, if any, can be used to prove that pentagon A(0, 4), B(7, 4), C(9, 2), D(7, 0), E(0, 0) and pentagon A'(0, -4), B'(-7, -4), C'(-9, -2), D'(-7, 0), E'(0, 0) are congruent?

ANSWER CHOICES 

A)(x,y) → (-x, y)


B)(x,y) → (x, -y)
C)(x,y) → (-x, -y)
D) The pentagons are not congruent.

Answer 1

Your answer is C. The pentagon is rotating at 90 degrees. (x,y,)->(-x,-y) is the same as (0,4,)->(0,-4) and (7,4)->(-7,-4) etc.

Answer 2

you answer would C because you go from positive x,y to -x,-y