The right triangle shown below is 8 squares high and 10 squares long. One of the following values is the ratio of the shaded area to the unshaded area. Which one?

Summary Submit Skip Question

The number of total squares is equal to the area.

$$ A= \frac{1}{2}bh $$ $$ A = \frac{1}{2}(8)(10) $$ $$ A = 40 \text{ squared units} $$

We can count the number of unshaded squares. There are 24.

The ratio of shaded to unshaded:

$$ 40-28 : 28 $$ $$ 12: 28 $$ $$ 3:7 $$