### Home > A2C > Chapter 8 > Lesson 8.1.4 > Problem 8-71

8-71.

Find the distance between two opposite corners of the box.

Draw a right triangle on the base of the box.

Find the measure of the hypotenuse.

4² + 5² = *c*²

Now draw a right triangle from the bottom corner to the top of the box.

Find the measure of that hypotenuse.

*c*² + 3² = *d*²

7.07'