Question

What is the total surface area of a cone having radius
and height 21​

Answer 1

Answer:

Step-by-step explanation:

Answer 2

Step-by-step explanation:

The formula of total surface area of a cone is

πr(l+r)

then the total surface area is

$\pi \times r \times (l + r ) \\ = \frac{22}{7} \times 21 \times (21 + 21) \\ = 22 \times 3 \times 42 \\ = 66 \times 42 \\ = 2772$