Triangles by definition have three sides; a two-sided triangle is impossible. In fact, no closed geometrical figure can be created out of only two straight lines. An angle is not closed. A vesica piscis is not made of straight lines. (This is the lens-like shape created in the intersection of two circles.)
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Isosceles.
Its not a triangle if it has only two sides.
An isosceles triangle has 2 equal sides whereas an equilateral triangle has 3 equal sides
An isosceles triangle has two congruent sides.
The answer is a Isosceles Triangle