Question

The curved surface area of a right circular cone of radius 11.3 cm is 710 cm². What is the slant height of the cone ? 

Answer 1

Curved surface area = 710 cm²

Radius (r) of base = 11.3 cm

Let Slant height be l .

`therefore pirl = 710`

⇒ `22/7 xx 11.3 xx l = 710`

⇒ `l = (710 xx 7)/(11.3 xx 22)`

⇒ l = 19.99 cm = 20cm

The slant height is 20 cm.