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Question
ABC is a triangle right angled at C. If AB = 25 cm and AC = 7 cm, find BC.
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Solution
By applying Pythagoras theorem in ΔABC,
(AC)2 + (BC)2 = (AB)2
(BC)2 = (AB)2 − (AC)2
(BC)2 = (25)2 − (7)2
(BC)2 = 625 − 49
(BC)2 = 576
∴ BC = 24 cm
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