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If an arc of (4\pi) cm subtends an angle of (72^\circ), what is the radius of the circle?यदि (4\pi) सेमी की चाप (72^\circ) का कोण बनाती है, तो वृत्त की त्रिज्या क्या होगी?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (10) cm(10) सेमी
(72^\circ=\frac{2\pi}{5}) and (r=\frac{s}{\theta}=\frac{4\pi}{2\pi/5}=10) cm. In exams, keep the angle in radians when using the formula.(72^\circ=\frac{2\pi}{5}) और (r=\frac{s}{\theta}=\frac{4\pi}{2\pi/5}=10) सेमी है। परीक्षा में कोण को रेडियन में रखकर सूत्र लगाएं।
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