# <span lang="EN-US

Height = h = 28 cm

Radius of base = r = 21 cm

Curved surface area of cone = πrl

Where l =

l =

l =

l =

l = 35 cm

Therefore,

Curved surface area = × 21 × 35

= 22 × 21 × 5

= 2310 cm2

Total surface area of cone = curved surface area + area of base

= 2310 + πr2

= 2310 + × 21 × 21

= 2310 + 22 × 3 × 21

= 2310 + 1386

= 3696 cm2

Volume of cone = πr2h

= × × 21 × 21 × 28

= 22 × 21 × 28

= 12936 cm3

Therefore, curved surface area is 2310 cm2, total surface area is 3696 cm2 and volume is 12936 cm3

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