Question

one circle has a ridius of 98cm and a second concentric circle has a ridus of 1m26cm . how much longer in the circumference of the second circle than that of the first

Answer 1

Let the radius of 1st circle be r1 & 2nd circle be r2.

Given:-
r1 = 98 cm
r2 = 1 m 26 cm
= 126 cm

Circumference of 1st circle = 2π(r1)
= 2*22/7*98 cm
= 616 cm

Circumference of 2nd circle = 2π(r2)
= 2*22/7*126 cm
= 792 cm

Difference of circumference of second circle & circumference of first circle = 792-616cm
= 176 cm Ans.

Ans.) The circumference of the second circle is 176 cm longer than that of the first.

Answer 2

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