Question

A lead pencil in shape of cylinder.the pencil is 21cm long with r=0.4cm and its lead is 0.1cm .what will be the volume of wood

Answer 1

hope this answer

helps you

Answer 2

The volume of the wood is 9.891 cubic centimeter.

Step-by-step explanation:

Given : A lead pencil in shape of cylinder. the pencil is 21 cm long with r=0.4 cm and its lead is 0.1 cm.

To find : What will be the volume of wood ?

Solution :

The pencil is 21 cm long with r=0.4 cm.

The volume of the pencil is $V=\pi r^2 h$

$V_p=\pi (0.4)^2 (21)$

$V_p=3.36\pi\ cm^3$

The lead is with R=0.1 cm.

The volume of the lead is $V=\pi R^2 h$

$V_l=\pi (0.1)^2 (21)$

$V_l=0.21\pi\ cm^3$

The volume of wood = Volume of pencil - Volume of lead

$V_w=3.36\pi-0.21\pi$

$V_w=\pi(3.36-0.21)$

$V_w=3.14\times 3.15$

$V_w=9.891\ cm^3$

Therefore, the volume of the wood is 9.891 cubic centimeter.

#Learn more

A toy is in the form of a cone mounted on a cylinder of common base radius 7 cm. The total  height of the toy is 25 cm and height of the coni cal part is 3 cm. Find the volume of the toy.​

https://brainly.in/question/13740917