Question

the volume of a circular iron rod of lenght 1m is 3850cm3. find its diameter

Answer 1

volume of cylinder = π r^2h
3850cm^3 =22 /7r ×r × 100cm
r^2 = 3850cm^3 ×7 /22 × 100cm
r^2 =7 /2 ×7 /2 cm ^2
r =7 /2 cm

diameter =7 /2 cm ×2
=7 cm