A circle is inscribed in a quadrilateral...

A circle is inscribed in a quadrilateral ABCD touching AB,BC, CD and AD at the points P,Q,R and S, respectively, and `angle B= 90^@`. If AD = 24 cm, AB=27 cm and DR = 6cm, then what is the circumference of the circle ?
एक वृत्त चतुर्भुज ABCD के भीतर स्थित है जो AB, BC, CD और AD को क्रमशः P, Q, R और S पर स्पर्श करता है और `angle B= 90^@` है | यदि AD = 24 सेमी, AB=27 सेमी और DR = 6 सेमी है, तो वृत्त की परिधि ज्ञात करें |

`20 pi`

`18 pi`

`15 pi`

`12 pi`

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