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ABCD is a quadrilateral such that `angle D= 90^@`. A circle with centre O touches the sides AB, BC and CD and DA at P, Q, R and S respectively. If BC = 40 cm, BP = 28 cm and CD = 25 cm, then what is the radius of the circle is:
ABCD एक चतुर्भुज है जैसे `angle D= 90^@` । केन्द्र O वाला एक वृत्त क्रमशः AB, BC और CD और DA को P, Q,R और S से छूता है। यदि BC = 40 सेमी, BP = 28 सेमी और CD = 25 सेमी है, तो वृत्त का त्रिज्या क्या है

A

12

B

13

C

5

D

8

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