Geometry Homework

Question

A computer monitor is 20 inches wide. The aspect radio, which is the ratio of the width of the screen to the height of the screen is 16:9. What is the length of the diagonal of the screen to the nearest whole inch?

Answer 1

First you must use a proportion to find the height of the screen:

16/9 = 20/h solve for by cross multiplying. h=11.25

Now use the Pythagorean theorem to find the diagonal. Use 20 and 11.25 as the sides of the right triangle.