Question

if circumference is 140 5.2 CM then the radius is______​

Answer 1

Answer:

radius will be 2.6 cm as ota diameter is 5.2Cm

Answer 2

Answer:

Height of pencil = 5.2 cm

Radius of pencil = 0.3 cm

Formula Used:

The volume of cylinder = πr2H

The volume of cone = (1/3) × πr2h

Calculation:

The radius of cone (r) = 0.3 cm

The height of cone (h) = 0.3 cm

The radius of cylinder = 0.3 cm (height of cone = radius of the cylinder because it is an isosceles right triangular cone)

∴ h = r

The height of cylinder = Total height of pencil - height of cone

∴ The height of cylinder (H) = 5.2 cm - 0.3 cm = 4.9 cm

The volume of pencil = The volume of cylinder + The volume of cone

The volume of pencil = πr2 (h/3 + H)

⇒ The volume of pencil = π(0.3)2(0.3/3 + 4.9) = 0.09π × 5

⇒ The volume of pencil = 0.45π cm3

The correct option is 1 i.e. 0.45π cm