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Sum of Opposite Angles of a Cyclic Quadrilateral

ABCD is a cyc...

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ABCD is a cyclic quadrilateral. AB = BC = CD = 10 cm. AD = 20 cm. Then find the radius of the circle.

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Q. A circle is inscribed in a quadrilateral

A B C D

touching its sides

A B, B C, C D, A D

P, Q, R

S

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Q. In the given figure, a circle is inscribed in a quadrilateral ABCD touching its sides Ab, BC, CD and AD at P, Q, R and S respectively.
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(c) 20 cm
(d) 21 cm

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r

5 r = ?

(Round-off to the nearest integer)

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then the length of BC is

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