Question

The perimeter of the rectangle whose length is 12 cm and a diagonal is 15 cm is

Answer 1

We know that 15cm is the hypotenuse of a right triangle with one side being 12cm.
So from the Pythagorean theorem we know that 15^2 - 12^2 will equal the square of the other side. 225 - 144 = 81 which is 8
9^2.
Therefore the rectangle has sides of 9 and 12
Area is 108cm^2 and perimeter is 42 cm.

@skb