Question

A rectangular brick has a length of 5 centimeters, a width of 9 centimeters and a height of 20 centimeters.What is the surface area of the brick

Answer 1

ANSWER
The surface area of the brick is;

$650 \: {cm}^{2}$

EXPLANATION

The dimensions of the rectangular brick are

$l = 5cm$
$w = 9cm$
$h = 20cm$

The total surface area of a rectangular brick is given by,

$T.S.A = 2(lw + lh + hw)$

We substitute the values into the formula to obtain,

$T.S.A = 2(5 \times 9 + 5 \times 20 + 9 \times 20)$

$T.S.A = 2(45+ 100+ 180)$

$T.S.A = 2(325)$

$T.S.A =650 \: {cm}^{2}$