Question

The slant height of closed cone is 7 times the radius of base.If radius is 3m.Find total surface area.​

Answer 1

Answer:

226.08cm²

Step-by-step explanation:

TSA of cone = πr(r+l)

Given

radius=3m

l(slant height)=7r=7(3)=21m

Answer 2

Step-by-step explanation:

Given: The slant height of closed cone is 7 times the radius of base.If radius is 3m.

To Find: Total surface area.

Solution:

Formula used:

$TSA = \pi \: l r + \pi {r}^{2} \\ \\ TSA = \pi \: r(l + r)$

Radius (r) : 3m

Slant height (l)=7r=7×3=21 m

To find TSA,put the values in the formula

$TSA = \frac{22}{7} \times 3(21 + 3) \\ \\ = \frac{22}{7} \times 3 \times 24 \\ \\ TSA= 226.29 \: {m}^{2}$

Thus,

TSA of closed cone is 226.29 m².

Hope it helps you.