# The diagonal of a rectangle measures 13 centimeters. One side is 12 centimeters long. How do you find the length of the other side?

##### 1 Answer

Oct 16, 2015

The lenght is

#### Explanation:

Let's say that the

Notice that the horizontal side, the vertical one and the diagonal form a right triangle, where the catheti are the sides of the rectangle and the hypotenuse is the diagonal. So, using Pythagora's theorem we get

From which we obtain