Question

The height of cone is 12 cm and radius is 5 cm then its slant height ______.

Options

• 17 cm

• 60 cm

• 7 cm

• 13 cm

Answer 1

The height of cone is 12 cm and radius is 5 cm then its slant height 13 cm.

Explanation:

The slant height `l` is the hypotenuse of the right triangle formed by the height and radius. 

So, `l = sqrt(h^2 + r^2)`.

Here `l = sqrt(12^2 + 5^2)`

= `sqrt(144 + 25)`

= `sqrt(169)`

= 13 cm