Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 1 - No. 9)
In a three-dimensional problem involving finding lengths or angles, which of the following is/are useful tools?
Identifying right-angled triangles within the object.
Applying Pythagoras' theorem.
Using the sine rule to find angles.
Using the Cosine rule.
解释
Right-angled triangles, Pythagoras, and Cosine Rule help in solving 3D problems.