Find the diagonal of a rectangle whose dimensions are cm and cm.
The rectangle's diagonal, length, and width form a right triangle with the rectangle's diagonal as the triangle's hypotenuse and
the rectangle's length and width as the triangle's other two
So, we can use Pythagoras' theorem, which states that the square
of the length of a right triangle's hypotenuse is equal to the sum
of the squares of the lengths of the other two sides. Substitute
the known lengths, and solve for the value of (the rectangle's