Question

the volume of right circular cylinder is 770 cm cube ,the height is 20 ,find the radius and curved surface area​

Answer 1

Answer:

r = 3.5 cm

CSA = 440 cm²

Step-by-step explanation:

Volume of cylinder = πr²h cu.units

770 = 22/7 × r² × 20

r² = 770 × 7 / 22 × 20

r² = 12.25

r = √12.25

r = 3.5 cm

Curved surface area = 2πrh sq.units

CSA = 2 × 22/7 × 3.5 × 20

= 440 cm²

Hope it helps you:)