Question

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

Answer 1

By applying Pythagoras theorem in $Δ\;ABC$,

$(AC)^2+ (BC)^2= (AB)^2$

$(BC)^2= (AB)^2- (AC)^2$

$(BC)^2= (25)^2- (7)^2$

$(BC)^2$ = $625 - 49 = 576$

$BC = 24$ $cm$