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Answer:
BC =4 cm.
Step-by-step explanation:
Given that AB =5cm ; AC=3cm . angle C =90°
In a right angled triangle, by Pythagoras theorem
AB^2= BC^2+ AC^2
BC^2 = AB^2 - AC^2
BC = √(AB^2-AC^2)
BC =√(5^2 - 3^2)
=√(25-9)
=√16
=4
BC = 4cm.
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