त्रिज्या (20) सेमी वाले वृत्त में \(72^\circ\) कोण से बने चाप की लंबाई क्या है?
What is the arc length made by an angle of \(72^\circ\) in a circle of radius (20) cm?
Explanation opens after your attempt
C. \(8\pi\) सेमी\(8\pi\) cm
Concept
\(72^\circ=\frac{2\pi}{5}\) and \(s=20\times \frac{2\pi}{5}=8\pi\) cm. Convert degrees to radians before finding the arc.
Why this answer is correct
The correct answer is C. \(8\pi\) सेमी / \(8\pi\) cm. \(72^\circ=\frac{2\pi}{5}\) and \(s=20\times \frac{2\pi}{5}=8\pi\) cm. Convert degrees to radians before finding the arc.
Exam Tip
\(72^\circ=\frac{2\pi}{5}\) और \(s=20\times \frac{2\pi}{5}=8\pi\) सेमी है। चाप निकालने से पहले डिग्री को रेडियन में बदलें।
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