Question

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.

COMPLETE EXPLANATION


​

Answer 1

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