Question

17) The diameter of a circular placemat is 30cm. Find the circumference to the nearest millimetre.

●the answer is 943mm but how please tell and solve it

plz.plz.plz.plz.plz...​

Answer 1

Step-by-step explanation:

first you have to half the diameter and then put the radius on the formula

2×22/7×15 (outcoming radius)

Answer 2

The diameter of a circular placemat is 30cm = 300 mm

.°. Radius (r) of the circular placemat is = 300/2 = 150 mm

We know that,

circumference of circle = 2πr

.°. the circumference of the circle = 2πr

= 2 × 22/7 × 150

= 6600/7 cm

= 943 mm (approximately)

.°. the circumference of the circle is 943 mm (approximately)