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