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The ratio of length of each equal side a...

The ratio of length of each equal side and the third side of an isosceles triangle is 3:4. If the area of the triangle is 18 √5 sq units, the third side is

A

`8 sqrt(2)` unit

B

12 unit

C

`16` unit

D

`5 sqrt(10)` unit

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The correct Answer is:
B
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