1 Face (2D) 4 Faces (3D) 3 Sides 3 Points, and 2 Congruent sides.
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because an isosceles triangle or any kind of triangle is 180 degrees.
It only has two equal lengths out of however many sides like an isosceles triangle
A isosceles triangle can have two equal angles, but an equilateral triangle is actually a special isosceles triangle, so it could also have 3.
An acute triangle can be an isosceles triangle, but it doesn't have to be. An isosceles triangle can be an acute triangle, but it doesn't have to be.
A right triangle and an isosceles triangle have the fact that they are both triangles in common. A right triangle can also be an isosceles triangle.