2.1 Important relationship between the
length of sides of a right-angled
triangle
3 In a right angled triangle: the square of
the hypotenuse is equal to the sum of
the squares of the other two sides.
4 If the triangle had a right angle (90°) and you
made a square on each of the three sides, then the
biggest square had the exact same area as the
other two squares put together!