Posted by Millie on Friday, February 10, 2012 at 5:05pm.
Angle C and Angle D are vertical angles. The conclusion is that angle C and angle D are complementary. Which is a counterexample of this conclusion.
* 2 vertical angles which are not complementary
or
* 2 complementary angles which are not vertical

MATH  Henry, Sunday, February 12, 2012 at 12:05pm
Ans. = A.