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From the figure:
m∠A = 53°+18° = 71°
m∠B = 53°+50° = 103°
m∠C = 50°+59° = 109°
m∠D = 18°+59° = 77°
From the figure:
m∠A = 53°+18° = 71°
m∠B = 53°+50° = 103°
m∠C = 50°+59° = 109°
m∠D = 18°+59° = 77°