त्रिज्या (10) सेमी और केंद्र कोण \( \frac{3\pi}{10} \) रेडियन हो तो त्रिज्यखंड का क्षेत्रफल क्या है?
If radius is (10) cm and central angle is \( \frac{3\pi}{10} \) radians, what is the area of the sector?
Explanation opens after your attempt
A. \(15\pi\) वर्ग सेमी\(15\pi\) square cm
Concept
Area is \( \frac{1}{2}r^2\theta=\frac{1}{2}\times100\times\frac{3\pi}{10}=15\pi \). Use this formula directly when the angle is in radians.
Why this answer is correct
The correct answer is A. \(15\pi\) वर्ग सेमी / \(15\pi\) square cm. Area is \( \frac{1}{2}r^2\theta=\frac{1}{2}\times100\times\frac{3\pi}{10}=15\pi \). Use this formula directly when the angle is in radians.
Exam Tip
क्षेत्रफल \( \frac{1}{2}r^2\theta=\frac{1}{2}\times100\times\frac{3\pi}{10}=15\pi \) है। कोण रेडियन में हो तो यह सूत्र सीधे लगाएं।
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