prove that angles of a quadrilateral is 360
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draw a diagonal in quadilateral and name angles.
in triangle 1 show ∠1+∠2+∠3=180°→(1)
similarly in triangle 2
∠4+∠5+∠6=180°→(2)
adding 1,2
∠a+∠b+∠c+∠d=360°
in triangle 1 show ∠1+∠2+∠3=180°→(1)
similarly in triangle 2
∠4+∠5+∠6=180°→(2)
adding 1,2
∠a+∠b+∠c+∠d=360°
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