Question

13.________is the total surface area of a cone if its slant height is 21m

and diameter of its base is 24m.​

Answer 1

Answer:

1244.57m2

Step-by-step explanation:

total surface area of a cone= πr(r+l)

radius of the base of cone= (24/2)m = 12m

slant height of cone= 21m

total surface area of a cone = πr(r+l)

= (22/7×12×(12+21)m2

= (22/7×12×33) m2

= 1244.57m2 ans

this can help you

Answer 2

Given :

Slant height of cone = 21 m

Diameter of base = 24 m

To find :

Total surface area of cone.

Solution :

Slant height, l = 21 m

Diameter , d = 24 m

∴ Radius , r = 24/2 = 12 m

∵ Total surface area of cone = πr(r + l) unit²

Now putting values,

⇒ TSA of cone = 22/7 × 12( 12 + 21) m²

⇒ TSA of cone = 22/7 × 12 × 33 m²

⇒ TSA of cone = 8712/7 m²

⇒ TSA of cone = 1244.57 m²

∴ Total surface area of cone = 1244.57 m²