Question

In a quadrilateral ABCD, ∠A = 600

, ∠B = 700

,and ∠C = 1200

, find angle ∠D​

Answer 1

Answer:

ANGLE SUM PROPERTY OF QUADRILATERAL

A+B+C+D=360

600+700+1200+D=360

2500+D=360

D=360-2500

D=-2140

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