16~\text{cm}^\text{2}\) This is Pythagoras' theorem. Pythagoras' theorem states that, in any right-angled triangle, the square of the hypotenuse is equal to the sum of the squares on the other two ...

You'll like draw a perfect square or rectangle by drawing congruent angles to form the box, and then congruent triangles (equilateral ... following congruent angles theorems dictates the different ...