# Thread: Which of the following is not true if?

1. ## Which of the following is not true if?

Which of the following is not true if

A) ∠1 ≅ ∠2.
B) m∠2 = 90°
C) ∠3 and ∠4 are supplementary.
D) m∠3+m∠4 = 90°
E) m∠1 = m∠3+m∠4

2. What do you think the answer is? WHY?

3. As usual with problems of this sort, this depends upon simply knowing the definitions. What is the definition of "perpendicular"? What is the definition of "supplementary"? If you don't know, look them up!