No. It can be used on any triangle.
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Isosceles triangle
1 line of symmetry.
Scalene triangles, rectangles, rhombi, concave polygons with 5 or more sides.
If they are congruent right angle triangles then just join them together side by side to form a parallelogram.
A right-angled triangle can have equal sides, but does not have to. A right-angled triangle with two equal sides CANNOT be an equilateral triangle. A right-angled triangle cannot be an equilateral triangle.Divide a square along the diagonal, and you are left with two right-angled triangles with two sides of equal length.