Question

In a quadrilateral, angle A= 80°, angleB=70°, and angle C = 100°, then find angle D.
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Answer 1

Answer:

Angle D = 110°

Step-by-step explanation:

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Answer 2

Answer:

sum of all angels of a quadrilateral =360⁰

therefore, A+B+C+D=360⁰

80⁰+70⁰+100⁰+D=360⁰

150⁰+100⁰+D=360⁰

250⁰+D=360⁰

D=360⁰- 250⁰

D=110⁰