Question

Find the area: to the nearest whole number

Answer 1

Answer:

The area of the composite area is 400 square millimeters.

Step-by-step explanation:

The area of the composite figure ($A$), in square millimeters, is found by multiplying the area of the equivalent rectangle, in which a semicircle of the original rectangle is move to the opposite side of the figure, so that quantity of area is conserved:

$A = w\cdot h$ (1)

Where:

$w$ - Width, in millimeters.

$h$ - Height, in millimeters.

If we know that $h = w = 20\,mm$, the area of the composite figure is:

$A = (20\,mm)\cdot (20\,mm)$

$A = 400\,mm^{2}$

The area of the composite area is 400 square millimeters.