<span>here we can use Pythogoras' theorem. in right angled triangles the square of the hypotenuse is equal to the sum of the squares of the other 2 sides. hypotenuse is 19 cm. One side is 13 cm and we need to find the length of the third side.
19</span>²<span> = 13</span>²<span> + X</span>²<span> X - length of the third side
