Question

A computer monitor has a width of 12 in. and a height of 9 in. What is the diagonal length of the monitor?

Answer 1

15 in

Explanation:

Using the formula d² = l² + w², we can substitute the numbers into their correct spots.

d x d = 9 x 9 + 12 x 12

d x d = 81 + 144

d x d = 225

Now we need to figure out what d is

15 x 15 = 225

So

15 squared = 9 squared + 12 squared

Meaning the answer is 15 in.