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7 cm त्रिज्या वाले एक वृत्त के उस त्रिज्यखण्ड, जो केंद्र पर 90° का कोण अंतरित करता है, का परिमाप है:

(A) 35 cm

(B) 11 cm

(C) 22 cm

(D) 25 cm

1 Answer

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Best answer

सही विकल्प है (D) 25 cm

दिया है,

r = 7 cm

\( \theta = 90^\circ\)

त्रिज्यखण्ड का परिमाप = \(2r + \frac{2\pi r\theta}{360}\)

\(= 2 \times 7 \text{ cm} + \frac{2 \times 22\times 7\text{ cm} \times 90^\circ}{7 \times 360^\circ}\)

\(= 14 \text{ cm} + 11 \text{ cm}\)

\(= 25 \text{ cm}\)

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