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Answer:
if ∠B is not a right angle, then m∠B ≠ 90°.
Step-by-step explanation:
The contrapositive of ...
If P, then Q.
is ...
If not Q, then not P.
__
Here, we have ...
P = m∠B = 90° ⇒ not P = m∠B ≠ 90°
Q = ∠B is a right angle ⇒ not Q = ∠B is not a right angle
Then the contrapositive is ...
If ∠B is not a right angle, then m∠B ≠ 90°.
