Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 3 - No. 10)

Which of the following statements is/are true when using Pythagoras' Theorem?

It applies only to right-angled triangles.

It can be used to find the length of any side if the other two sides are known.

It relates the squares of the sides.

It relates the lengths of the sides to the angles.

The Pythagorean Theorem helps solve right angled triangles.