Question

Given ∠ABC is a right angle. Prove ∠1 and ∠2 are complementary.
Write a two column Proof.

Answer 1

m∠ABC = 90 degrees
m∠1 + m∠2 = m∠ABC
Use transitive property of equality
m∠1 + m∠2 = 90 degrees.
According to the definition of complementary angles, ∠1 and ∠2 must be complementary.

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