Right angeled triangle's legs relate as 3:7 and the height between the vertex (where the angle is 90 degrees) and the hypotenuse is 42 cm. How to find the projections of the legs. The answers are 18 cm and 98 cm. By using Height's theoreme according to the formula that h^2=f*g where h is height, f and g are projections (f+g=hypotenuse), the answers are right but I don't really find the way to find these answers.