Given that ∠a and ∠b are supplementary, daisy conjectured that ∠a≅∠b .

which statement is a counterexample to daisy's conjecture?

a.) m∠a=45° and m∠b=45°

b.) m∠a=40° and m∠b=140°

c.) m∠a=90° and m∠b=90°

d.) m∠a=50° and m∠b=120°

When two angles are supplementary, that means that the sum of their individual angles is equal to a straight line, which is 180°. If you add another restriction where the two supplementary angles are equal, then each vale of the angle constitutes half of 180°. Then, that means that ∠A = ∠B = 90°. The answer is C.