Pythagoras' theorem can also be used to solve 3D problems. You often need to use Pythagoras' theorem more than once in each problem as we create extra right-angled triangles in the 3D shapes.

The shape ABCDEFGH is a cuboid. Length AB is 6 cm, length BG is 3 cm and length FG is 2 cm. Calculate the length AF. Draw the right-angled triangle ACF and label the ...

In 2022, two high school students created a trigonometric proof of the Pythagorean Theorem—something that’s only ever been accomplished by a few professional mathematicians. Now, a new article ...