The perpendicular height is the height at a right angle to the base of the triangle. The isosceles triangle can be split into two right-angled triangles. Pythagoras’ theorem can then be used on ...

It may be necessary to use Pythagoras' theorem and trigonometry to solve a problem. The shape ABCDEFGH is a cuboid. Length AB is 6 cm, length BG is 3 cm and length FG ...