Question

A schoolroom is $12$m long $8$m wide and $5$ m high. Find the area of its four walls$\left(in{m}^2\right)$.

Answer 1

Length $\left(l\right)=12m$

Heighta $\left(h\right)=5m$

Width $\left(b\right)=8m$

$\therefore$ Area of four walls $=2(l+b)h=2(12+8)\times 5=200m^2$

Hence, the correct answer is $200m^2$.