Question

find the surface area of the cylinder if circumference=110cm and height=20cm

Answer 1

Hi

Here is ur answer

Circumference = 110

2$\pi$r = 110

2 * 22 /7 * r = 110

Therefore, r =35/2

Surface area of a cylinder = 2$\pi rh+2\pi r^{2}$

                                           = 2 * 22/7 *35/2 * 20 + 2 * 22/7 *35/2 *35/2

Take 22/7 , 35/2 , 2 commmon

                            = 2 * 22/7 *35/2 ( 20 + 35/2)

                            = 110 ( 40 +35 )/2

                            = 55 * 75

                            = 4125 cm^2

Hope it helps U