Expert Mathematics Trigonometric Functions Class 11 Level 68

किसी त्रिज्यखंड का क्षेत्रफल पूरे वृत्त के क्षेत्रफल का \(\frac{3}{4}\) है। केंद्रीय कोण रेडियन में क्या है?

The area of a sector is \(\frac{3}{4}\) of the area of the whole circle. What is the central angle in radians?

Explanation opens after your attempt
Correct Answer

C. \(\frac{3\pi}{2}\)

Step 1

Concept

The area ratio is \(\frac{\theta}{2\pi}\). From \(\frac{\theta}{2\pi}=\frac{3}{4}\) we get \(\theta=\frac{3\pi}{2}\).

Step 2

Why this answer is correct

The correct answer is C. \(\frac{3\pi}{2}\). The area ratio is \(\frac{\theta}{2\pi}\). From \(\frac{\theta}{2\pi}=\frac{3}{4}\) we get \(\theta=\frac{3\pi}{2}\).

Step 3

Exam Tip

क्षेत्रफल का अनुपात \(\frac{\theta}{2\pi}\) होता है। \(\frac{\theta}{2\pi}=\frac{3}{4}\) से \(\theta=\frac{3\pi}{2}\) है।

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Mathematics Answer, Explanation and Revision Hints

किसी त्रिज्यखंड का क्षेत्रफल पूरे वृत्त के क्षेत्रफल का \(\frac{3}{4}\) है। केंद्रीय कोण रेडियन में क्या है? / The area of a sector is \(\frac{3}{4}\) of the area of the whole circle. What is the central angle in radians?

Correct Answer: C. \(\frac{3\pi}{2}\). Explanation: क्षेत्रफल का अनुपात \(\frac{\theta}{2\pi}\) होता है। \(\frac{\theta}{2\pi}=\frac{3}{4}\) से \(\theta=\frac{3\pi}{2}\) है। / The area ratio is \(\frac{\theta}{2\pi}\). From \(\frac{\theta}{2\pi}=\frac{3}{4}\) we get \(\theta=\frac{3\pi}{2}\).

Which concept should I revise for this Mathematics MCQ?

The area ratio is \(\frac{\theta}{2\pi}\). From \(\frac{\theta}{2\pi}=\frac{3}{4}\) we get \(\theta=\frac{3\pi}{2}\).

What exam hint can help solve this Mathematics question?

क्षेत्रफल का अनुपात \(\frac{\theta}{2\pi}\) होता है। \(\frac{\theta}{2\pi}=\frac{3}{4}\) से \(\theta=\frac{3\pi}{2}\) है।

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