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A sector has radius 9 cm and central angle 80°. What is the length of its arc?एक सेक्टर की त्रिज्या 9 सेमी और केंद्रीय कोण 80° है। उसके चाप की लंबाई कितनी है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: 4π cm4π cm
Convert the angle to radians: 80° = 4π/9. The arc length is s = rθ = 9 × 4π/9 = 4π cm.कोण को रेडियन में बदलें: 80° = 4π/9। चाप की लंबाई s = rθ = 9 × 4π/9 = 4π सेमी है।
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