Question

The curved surface area of glass having radii 3 cm and 4 cm respectively and slant height 10 cm is ______.

Options

• 55 cm²

• 110 cm²

• 220 cm²

• 440 cm²

Answer 1

The curved surface area of glass having radii 3 cm and 4 cm respectively and slant height 10 cm is 220 cm².

Explanation:

Here r = 3 cm, R = 4 cm, l = 10 cm

∴ Curved surface area = πl(r + R)

`= 22/7 xx 10(3 + 4)`

= `22/7 xx 10 xx 7`

= 220 cm²