alleryA sector of angle 60 degrees is cut from a circle of radius 21 cm. Using pi = 22/7, what is its area?
A462 cm2
B231 cm2
C115.5 cm2
D693 cm2
Answer & Solution
Correct answer: B. 231 cm2
1. Sector area = (angle/360) × πr2.
2. (60/360) × (22/7) × 21 × 21 = (1/6) × 1386.
3. That is 231 cm2.
_Source: NCERT Class 10 Mathematics, Chapter 11 Areas Related to Circles, 11.1_
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