Question

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Answer 1

∠ A = ∠ B = 101° , ∠ C = ∠ D = 79°

Explanation:

• lower base angles are congruent

• upper base angles are congruent

• any lower base angle is supplementary to any upper base angle

then

∠ C = ∠ D = 79° ( lower base angles are congruent )

∠ C + ∠ B = 180° ( supplementary angles )

79° + ∠ B = 180° ( subtract 79° from both sides )

∠ B = 101°

∠A = ∠ B = 101° ( upper base angles are congruent )