Question

find circumference of raidus 7cm , 3.5cm , 14cm and 21cm

Answer 1

circumference:
radius:7
2πr=2×22/7×7=44cm
radius:35/10
2πr=2×22/7×35/10=22
radius:14
2×22/7×14=88
radius:21
2×22/7×21=132

Answer 2

formula----2πr
7cm=2×22/7×7
44cm
3.5cm= 2×22/7×3.5
22cm
14cm=2×22/7×14
88cm
21cm=2×22/7×21
132cm