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प्रश्न
The length of a tangent drawn from a point at a distance of 10 cm of the circle is 8 cm. The radius of the circle is ______
पर्याय
4 cm
5 cm
6 cm
7 cm
MCQ
रिकाम्या जागा भरा
उत्तर
The length of a tangent drawn from a point at a distance of 10 cm of the circle is 8 cm. The radius of the circle is 6 cm.
Explanation:
In rt. AOAP, we have
OA² + AP² = OP²
⇒ OA² + (8)² = (10)2
⇒ OA² + 64 = 100
⇒ OA² = 100 - 64 = 36
∴ OA = `sqrt36` = 6 cm
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