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Answer :
In right angled?ABC, we have
\( BC^2 + 7^2 = 25^2 \)(By Pythagoras property)
Or, \( BC^2 + 49 = 625 \)
Or, \( BC^2 = 625 – 49 \)
Or, \( BC^2 = 576 \)
\(\therefore BC = \sqrt{576} = 24 cm \)
Thus, the required length of BC = 24 cm.