Tringle ABC right angled at B. If AB = 3cm
and Ac = 5cm, find BC.
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Answer:
BC = 4 cm
Step-by-step explanation:
Since ABC is a right angled triangle and angle B = 90°
AB = 3 cm
AC = 5 cm
•°• AC² = BC² + AB² (by Pythagoras theorem)
=> 5² = BC² + 3²
25 = BC² + 9
BC² = 25 - 9
BC² = 16
BC = √16
BC = 4
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