Yes because the sum of its smallest sides is greater than its longest side
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No. But they can be the lengths of the three sides.
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an isosceles triangle is a triangle with two of its sides equal and one side different such as a triangles sides that measure as 10 cm 10 cm and 7cm, this would be an isosceles triangle as one of the sides is not the same length as the other two, hope this helped :)
If the "length" of this triangle is the distance from the base to the vertex of the two other sides, it is 100 units^2. (1/2*10*20) if the 'length' is not the aforementioned distance, you do not have enough information.
A triangle has 3 sides.