that's an iscoceles triangle...
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Only two equal side lengths
Isosceles.
A triangle with 2 equal side lengths is called an isosceles triangle.
You must have more information to determine what type of triangle it is. If two of the lengths are equal, it is isosceles. If all three of the lengths are equal, it is equilateral. If none of them are equal, it is scalene. It may also be a right triangle if it is isosceles or scalene.
A triangle with two equal side lengths is an isosceles triangle.