Suppose DeltaABC be a right-angled trian...

Suppose `DeltaABC` be a right-angled triangle where `angleA= 90^@` and AD is perpendicular to BC. If ar `Delta ABC = 40 cm^2, ar DeltaACD = 10 cm^2` and `bar(AC) = 9 cm`, then the length of BC is

A

4 cm

B

6 cm

C

12 cm

D

18 cm

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