Question

2)
The area of a circle is 491 cm2. Its circumference is
(A) 71 cm
(B) 147 cm
(C) 211 cm
(D) 287 cm​

Answer 1

78.50cm

Step-by-step explanation:

Given , area of the circle = 491 m²

=> πr² = 491 m²

=>22/7 × r² = 491 m²

=> r² = 491 ÷ 22/7

=> r² = 491 × 7/22

=> r² = 156.22

=> r = √156.22

=> r = 12.49

Circumference of a circle = 2πr

= 2 × 22/7 × 12.49

= 78.50cm.

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Answer 2

Given , area of the circle = 491 cm²

=> πr² = 491 cm²

=>22/7 × r² = 491 cm²

=> r² = 491 ÷ 22/7

=> r² = 491 × 7/22

=> r² = 156.22

=> r = √156.22

=> r = 12.49 cm

Circumference of a circle = 2πr

= 2 × 22/7 × 12.49

= 78.55cm.