Question

The radius of the base of the cone is an 5cm

Answer 1

Answer:

The total surface area of cone is 70π cm² or 219.9 cm².

Step-by-step explanation:

Given that the formula of total surface area of cone is T.S.A = πr² + πrl where r represents radius and l is slant height. So you have to substitute the values :

$t.s.a = \pi {r}^{2} + \pi{r}l$

$let \: r = 5 \: , \: l = 9$

$t.s.a = \pi {(5)}^{2} + \pi(5)(9)$

$t.s.a = 25\pi + 45\pi$

$t.s. a = 70\pi \: or \: 219.9 \:$