Question

b) Find the value of angle D of a cyclic quadrilateral, if angle B is 80°.
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Answer 1

Answer:

In the given figure,

ABCD is a cyclic quadrilateral

∠ADC=80° and ∠ACD=52°

Now, in cyclic quadrilateral ABCD

∠ABC+∠ADC=180

o

(Sum of opposite angles =180

o

)

⇒∠ABC+80

o

=180

o

⇒∠ABC=100

o

this is the answer