Find the length of lace needed to put around the edge of a dozen round table cloths diameter 70 cm. Find its cost at the rate 15 per metre.
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d= 70 cm therefore r = 35 cm
hence, circumference of circle = 2πr
= 2 × π×r
= 2 × 22/7 × 35
= 220 cm
in meter it will be 2.2 meter
now cost of 12 such table for lacing will be =. 2.2 × 12 × 15
= 396 rs
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