Question

a circular ground of diameter 21 m is to be fenced with 2 round of rods.Find the length of the rope required.

Answer 1

Refer to the above attachment

Answer 2

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Here is the solution:

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Find the Radius:

Radius = Diameter ÷ 2

Radius = 21 ÷ 2 = 10.5 m

Find the circumference:

Circumference = 2πr

Circumference = 2π(10.5) = 66 m

Find the length of the rope:

one round  = 66 m

two rounds = 66 x 2 = 132 m

Answer: The rope is 132 m long.