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In triangle ABC, the two equal sides satisfy AB = AC = 6. If the triangle's circumradius is 5, find the length of the base BC.

1. 25/3
2. 9
3. 48/5
4. 10

Correct answer: 48/5

Solution

For the isosceles triangle, express the circumradius in terms of the sides and the area (found via the altitude to the base), then solve for the base a = BC.

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