Question

2. ABC is a triangle, right-angled at C. If AB = 25
cm and AC=7 cm, find BC

Answer 1

triangle ABC is right angle triangle which is right angled at C

so we get that AB is a hypotenuse , BC  is base and AC is height .

so from the Pythagorean theorem we know that AB²= BC²+AC²

so , 25² = BC²+ 7²

or, BC² = 25²-7²

or, BC² =  625-49= 576

or , BC = √576= 24

so BC is equal to 24 cm