Question

If the diameter and height of a right circular cone are $12cm$ and $8cm$ respectively, then the slant height is

• A. $10cm$
• B. $20cm$
• C. $30cm$
• D. $96cm$

Answer 1

Answer: (A)

$10cm$

We have,

$d=12cm$

$r=6cm$

$h=8cm$

We know that the slant height

$l=\sqrt{r^2+h^2}$

So,

$l=\sqrt{6^2+8^2}$

$l=\sqrt{36+64}$

$l=\sqrt{100}=10cm$

Hence, this is the answer.