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jmc

geometry senior

Problem

Two noncongruent integer-sided isosceles triangles have the same perimeter and the same area. The ratio of the lengths of the bases of the two triangles is . Find the minimum possible value of their common perimeter.
Solution
Let the first triangle have side lengths , , , and the second triangle have side lengths , , , where . Equal perimeter: Equal Area: Since and are integer, the minimum occurs when , , and . Hence, the perimeter is .
Final answer
676