Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 8 - No. 5)
In triangle ABC, if angle A is 90 degrees, side AB is 3, and side AC is 4, what is the length of side BC?
3
4
5
7
คำอธิบาย
Pythagorean theorem: BC² = 3² + 4² => BC = 5