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ANSWER ➡️
EXPLANATION➡️
⏺️BC = √ ( b² + c² ) ; [ By Pythagoras theorem ]
Area of ∆ ABC = 1/2 x b x c ______(1)
Area of ∆ ABC = 1/2 x BC x AD ____(2)
⏺️Equating (1) and (2)
1/2 x b x c = 1/2 x BC x AD
==> bc = BC x AD
==> AD = bc / BC
⏺️Putting the value of BC.