Question

Find the surface area of a cylinder with diameter 5.8 mm and height 11.9 mm.

Answer 1

A = 2πrh + 2πr²

Radius = 1/2 diameter
Radius = 1/2 (5.8)
Radius = 2.9

A = 2(3.14) (2.9) (11.9) + 2(3.14) (2.9)²
A = 216.7228 + 52.8148
A = 269.5376mm²

Answer 2

Radius=5.8/2=2.9 mm
Surface area=2πr(h+r)
=2*3.14*2.9(11.9+2.9)
=6*41.18*14.8
=3656.784 mm²