SOLUTION: Given: m<GHI=12 m<AEB=78 Prove: <GHI and <DEC are complementary

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Question 998385: Given: m m Prove:
Answer by ikleyn(52831) About Me  (Show Source):
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12° + 78° = 90°.

If the sum of measures of two angles is  90°,  these angles are complementary by the definition.