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Areas of Isosceles Triangles

GMAT-FU4HXY

Two isosceles triangles have the same area. One has base length $6$ and the other has base length $5$.

If the triangle with base $6$ has another side equal to $5$, what is the area of each individual triangle?

A

$6$

B

$12$

C

$6\sqrt3$

D

$12\sqrt3$

E

None of these answer choices are correct.