Question

If the radius and the height of a cone is 3 cm and 4 cm respectively, then its slant height is .

• A. 5 cm
• B. 4 cm
• C. 7 cm

Answer 1

The correct option is A 5 cm

Given,
the radius of the cone 'r' = 3 cm,
the height of the cone 'h' = 4 cm.


Applying pythagoras theorem, we get,

$r^2+h^2=l^2$
$\Rightarrow 3^2+4^2=l^2$

$\Rightarrow l=\sqrt{3^2+4^2}cm$
$=\sqrt{9+16}cm$
$\sqrt{25}cm$
$=5cm$