Question

one circle has a radius of 98 cm and the second concentric circle has a radius of 1m 26 cm , how much longer is the circumference of the second circle than the other

Answer 1

circumference of first circle=2πr

=2*22/7*98=616

circumference of second circle=2πr

=2*22/7*126=792

792-616=176

therefore its circumference is 176cm longer than the other

Answer 2

Concentric circles: Two or more circles which have the same center point.

Circumference of inner circle= 2πr

                                                =2*22/7*98= 616cm

Circumference of outer circle=2πR

                                                =2*22/7*126= 792cm

Difference in the length of the circumference= 792-616= 176cm

Ans:176cm