Question

construct a right angled triangle ABC right angled at B, such that BC=4cm and AC=5cm. Measure AB.

Answer 1

AB is 3 since u can use pythagoras theorem
AB^2+BC^2=AC^2

Answer 2

Ac sq=absq plus bc sq
5 sq=4 sq+ab sq
Ab sq =25-16
Ab sq=9
Ab=3