Question

prove that the sum of the angles of a quadrilateral is 360°​

Answer 1

here is your answer.It is in the above pic.

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Answer 2

let the angles be

1=x

2=x

3=x

4=x

then x+x+x+x=360

4x=360

x=360/4

x=90

then

90+90+90+90=360

hence proved

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