Question

Area of a circle=154cm2. find its circumference.​

Answer 1

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Required data,

Area of a circle=154cm²

To solve the sum we use the formula of area of a circle

Formula of area of circle=πr²

Area of a circle=πr²=154 cm²

πr²=154

or,22/7×r²=154

or,r²=154×7/22

or,r²=49

or,√r²=√49

or,r=7

radius of the circle=7cm

diameter of the circle=14 cm

circumference of the circle=2πr

therefore circumference of the circle=2×22/7×7cm

=44 cm