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In a circle, an angle of (54^\circ) subtends an arc of (9\pi) cm. What is the radius of the circle?किसी वृत्त में (54^\circ) का कोण (\9\pi) सेमी चाप बनाता है। वृत्त की त्रिज्या क्या होगी?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (30) cm(30) सेमी
(54^\circ=\frac{3\pi}{10}) and from (s=r\theta), (r=\frac{9\pi}{\frac{3\pi}{10}}=30). In exams, convert degrees into radians before using the arc formula.(54^\circ=\frac{3\pi}{10}) और (s=r\theta) से (r=\frac{9\pi}{\frac{3\pi}{10}}=30)। परीक्षा में डिग्री को रेडियन में बदलकर ही चाप सूत्र लगाएं।
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