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प्रश्न
If the area of a circle is 154 cm2, then is perimeter is ______.
रिकाम्या जागा भरा
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उत्तर
If the area of a circle is 154 cm2, then is perimeter is 44 cm.
Explanation:
A = πr2 = 154
⇒ `r^2 = 154/π`
= `154 ÷ 22/7`
= 49
⇒ r = 7 cm
Perimeter (circumference) = 2πr
= `2 xx 22/7 xx 7`
= 44 cm
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