Question

Find the total surface area of a cone, if its slant height is 21 m and diameter of its base is 24 m​

Answer 1

✨Hi mate here is the answer:-✨

Radius (r)= 24/2=12 m.

Slant height (l)= 21m.

TSA of a cone = πr(l+r)

$= \frac{22}{7} \times 12(21 + 12) \\ = \frac{22}{7} \times 12 \times 33$

= 3.14 × 396

= 1243.44 m^2

▫️:Hope it helps you:▫️

Answer 2

Step-by-step explanation:

Given:

slant height as l : 21m

radius as r : 24/2 = 12m

Tsa of a cone = πr(l+r)

=>22/7*12(21+12)

=>22/7*12*33

=>22/7*396

=>8712/7

=>1244.57m²

Thus the total surface area of the cone is 1244.57m²