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A circle touches the side PQ of a triang...

A circle touches the side PQ of a `triangle APQ` at the point R and sides AP and AQ produced at the points B and C, respectively. If the perimeter of `triangle APQ` = 30 cm, then the length of AB is :
एक वृत्त त्रिभुज APQ की भुजा PQ को बिंदु R पर स्पर्श करता है तथा भुजाओं AP और AQ को क्रमश: बिंदु B और C तक बढ़ाया जाता है | यदि त्रिभुज APQ का परिमाप = 30 सेमी है, तो AB की लंबाई ज्ञात करें |

A

20 cm

B

10 cm

C

12 cm

D

15 cm

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