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Tess makes a circular flower bed of diameter 4 metres. She puts a single line of paving blocks around the outside of the flower bed. Each block is 20 cm in length. How many blocks does she need to go around the whole flower bed?

Answer :

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Circumference of a circle = PI x diameter = 3.14 x 4 = 12.56 meters

Multiply by 100 to change to centimeters: 12.56 x 100 = 1,256 cm.

Divide total distance by length of blocks: 1256 / 20 = 62.8

Round up to 63 blocks needed.

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