Question

the radius of a cone is 5 cm and ts length its height is 12cm then find csa and volume of cone

Answer 1

r = 5cm
h = 12cm
l = ?
l^2 = h^2 + r^2
l^2 = (12)^2 + (5)^2
l^2 = 144 + 25 
l^2 = 169
l = 13

nom we have 

l = 13cm , h = 12cm or r = 5cm
CSA of cone = 22/7 × r × l
CSA = 22/7 × 5 × 13 
CSA = 1430/7

CSA = 204.28

Volume of Cone = 1 / 3 × πr^2 × h

1 / 3 × 3.14 × 25 × 12

3.14 × 100

314 cm.

Answer 2

Hey friend, Here is your answer-
Let the r = 5 cm and h = 12 cm
l^2 = r^2 + h^2
l^2 = 5^2 + 12^2
l^2 = 25 + 144
l^2 = 169
l = 13 cm

Curved surface area of cone = pie × r × l
= 3.14 × 5 × 13
= 3.14 × 65
= 204.10 cm2

Volume of cone = 1/3 × pie × r^2 × h
= 1/3 × 3.14 × 25 × 12
= 3.14 × 100
= 314 cm3

Hope it will help you.
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