Question

A closed box is made up of wood which is 1 cm thick the outer dimension of the box is a 5 cm into 4 cm into 7 cm find the volume of the wood used

Answer 1

geometric construction

Answer 2

external L = 5 cm

external B=4cm

ext.height =7cm

so volume =5*4*7

=140cmcube

now

internal L= 5-2*thickness

=5-2

=3cm

Simillarly

internalB=2cm

internal H=5M

so internal volume = 30cm cube

Now

volume of wood = external vol. -- internal vol.

140-30 cm cube

110cm cube is ur answr