Question

from solid cylinder whose height is 3.6 cm and diameter is 1.4 CM half conical cavity of the same height and same diameter is hollowed out find the total surface area of remaining solid​

Answer 1

Answer:

Given,

A solid pole consists of two cylinders.

Dimension of the first cylinder

Height = 210cm

Radius = 21cm

Dimension of the second cylinder

Height = 70cm

Radius = 7cm

We need to find out the volume of pole. So, firstly, find out the volumes of two cylinders, and thereafter, add both the volumes of cylinder, that's what the volume of pole.

Volume of the first cylinder

→ π r²h

→ 22/7 × 21 × 21 × 210

→ 22 × 3 × 21 × 210

→ 291060cm³

Volume of the second cylinder

→ πr²h

→ 22/7 × 7 × 7 × 70

→ 22 × 7 × 70

→ 10780cm³

Volume of pole = volume of the first cylinder+ volume of the second cylinder

•°• Volume of pole = 291060 + 10780 = 301840cm³