Question

Merly wants to sew a lace around a circular tablecloth. Its radius is 30 cm. How many centimeters of lace will she need?

Answer 1

For that we need to find circumference of table cloth as the lace is to be see at the edge of it.

>>circumference of circle:
$2\pi \times r$

>>circumference of table cloth:
$2 \times 3.14 \times 30 \: {cm}$
$188.4 cm$

>>Length of lace required:
$188.4cm$

Hope it will help you