Question

Find the volume, curved surface area and the total surface area of cone
having base radius 35 cm and height 84 cm.
​

Answer 1

Cone of:-

Radius ( R ) = 35 cm

and Height (H) = 84 cm

1) Volume :-

-> ⅓ Π R² H

so Volume = ⅓× 22/7 × (35)²× 84

Volume = 1.08× 10^5 cm³

2)C. S. A = ΠRL

Now *l* to be find out !

Take the half of Cone so a triangle will formed

so the base is ½ of R = 17.5 cm

Height = 84cm

•°• l = √ (17.5)² + (84)²

l = 390.25 cm

so C. S. A = ΠRl

C. S. A = 22/7 × 35 × 390.25

C. S. A = 42927.25 cm ²

3)T. S. A = ΠR(l+R)

so T. S. A = 22/7 × 35(309.25+35)

T. S. A = 45635.975 cm².

Answer 2

Hope it will help you