Question

A cylindrical container with internal diameter of its base 20 cm, contains water upto a height of 14 cm. Find the area of the wet surface of the cylinder.

Answer 1

Inner diameter of base = 20cm
Radius = 10cm
Area of the wet surface of the cylinder
= Inner curved area of cylinder + area of base
= 2πrh + πr²
= 2π x 10 x 14 + π(10)²
= 280π + 100π
= 380π
= 1194 cm²
∴ Area of the wet surface of the cylinder is 1194 cm².