Question

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

Answer 1

circumference of raidus 7cm =2*22/7*7=44cm
circumference of raidus 3.5cm =2*22/7*3.5=22cm
circumference of raidus 14cm =2*22/7*14=88cm
circumference of raidus 21cm =2*22/7*21=132cm

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Answer 2

circumference with radius 7cm

= (2*22*7)/7 = 2*22 = 44cm

2)- circumference with radius 3.5 cm

=(2*22*3.5)/7= 44*3.5/7 =22cm

3)- circumference with radius 14cm

=(2*22*14)/7 = 44*2=  88cm 

4)- circumference with radius 21cm

= (2*22*21)/7 = 44*3 = 132cm

i hope this much will help