Question

fin the total surface area of cone if it's slant height is 21m and diameter of it's base is 24m.​

Answer 1

Total surface area of a cone

= πr(r+l)

= π(12)(12+21)

= 12π(33)

= 396π

= 396(3.14)

= 1243.44

Hence, the answer is 1243.44m²

Answer 2

Diameter of cone =24m

Radius of cone =12m

Total surface area of cone = πr(l+r)

=22/7×12(21+12)

=1244.57m²(approx.)

I Hope it's help you