Exercise 40 Page 63

We can use the values shown on the given diagram to calculate the perimeter and area of the triangle.

Finding the Perimeter

To find the perimeter, we need the length of all three sides of this right triangle. From the figure, we know that two segments are marked with one hatch mark. Therefore, both of them have the same length. Additionally, we know that $2.5\text{ cm}$ is approximately equal to $1\text{ inch},$ so we can convert the side lengths into inches right away.