A wooden block of dimensions $80 c m \times 40 c m \times 20 c m$ is to be covered with coloured paper. How many square sheets of paper of side 20 cm will be required?

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Solution

Given dimensions of wooden block $= 80 c m \times 40 c m \times 20 c m$

Then surface Area of the box $= 2 [ℓ b + b h + ℓ h]$

$= 2 [80 \times 40 + 40 \times 20 + 80 \times 20]$

$= 11200 c m^{2}$

The number of sheets required = $\frac{S u r f a c e a r e a o f t h e b o x}{A r e a o f o n e s h e e t o f b o x p e r}$

$= \frac{11200}{20^{2}}$

$= 28$

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A wooden block of dimensions 80cm×40cm×20cm is to be covered with coloured paper. How many square sheets of paper of side 20 cm will be required?

Given dimensions of wooden block =80 cm×40 cm×20 cmThen surface Area of the box =2[ℓb+bh+ℓh] =2[80×40+40×20+80×20] =11200 cm2The number of sheets required = Surface area of the boxArea of one sheet of box per =11200202 =28

A wooden block of dimensions $80 c m \times 40 c m \times 20 c m$ is to be covered with coloured paper. How many square sheets of paper of side 20 cm will be required?