prove that the sum of the angles of a quadrilateral is equal to four right angles
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ABCD is a quadrilateral having all four angles equal.
Let each angle be x
We know sum of measure of all four angles of quadrilateral is 360
o
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∴ ∠A+∠B+∠C+∠D=360
o
⇒ x+x+x+x=360
o
⇒ 4x=360
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⇒ x=90
o
∴ The measure of angles of quadrilaterals are 90
o
,90
o
,90
o
,90
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