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They are triangles all of whose sides are of the same length.

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Are triangles isosceles?

They can be. There are 4 types of triangles: scalene, equilateral, right, and isosceles. A triangle can only be isosceles under the circumstance that it has at least 2 equal sides.


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What is the maximum area in square feet of the isosceles triangle if the perimeter is 9 feet?

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