Question

plzz help me plzzzz​

Answer 1

Here ABCD is cyclic quadrilateral for that ,

angle A + angle C = 180° ......(1)

{ sum of opposite angle of cyc.quadri. is equal to 180° }

angle A - angle C = 20° { given } ........(2)

add equation (1) and (2)

angle A + B + A - C = 180° + 20°

2 ( angle A ) = 200°

[ 【 angle A = 100° 】 ]

angle A - C = 20°

100° - angle C = 20°

[ 【angle C = 80°】 ]

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Answer 2

In cyclic quadrilateral ABCD, ‹A+‹C=180°......1

‹A-‹C=20°........2

Adding 1&2,we get

2‹A=180°+20°

2‹A=200°

‹A=100°

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