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The sum of either pair of opposite angles of a cyclic quadrilateral is 180

Posted by Manjeet Singh 5 years, 11 months ago

CBSE > Class 09 > Mathematics

1 answers

Yogita Ingle 5 years, 11 months ago

Given : Let ABCD is cyclic quadrilateral.
To prove : ∠A + ∠C = 180° and ∠B + ∠D = 180°.
Construction : join OB and OD.

Proof : ∠BOD = 2 ∠BAD
     ∠BAD = 1/2∠ BOD
Similarly ∠BCD = 1/2 ∠DOB
∠BAD + ∠BCD = 1/2∠BOD + 1/2 ∠DOB
                   =1/2(∠ BOD + ∠DOB)
                   = (1/2)X360° = 180°
Similarly ∠B + ∠D = 180°

1Thank You

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CBSE > Class 09 > Mathematics