Name: 1 Mark
Theorem: 1 Mark
Answer: 1 Mark
Since ∠C is 90∘, the following is a right-angled triangle.
The theorem used is known as Pythagoras Theorem.
In a right angled triangle,
Base2 + perpendicular2 = hypotenuse2 (Pythagaros's Theorem)
Or, AB2 = BC2 + AC2
Or, AB2 = 16 + 9 = 25
Or, AB = √25 = 5