Every triangle has three vertices (vertexes).
If it has less than 3 or more than 3, it isn't a triangle.
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3 because of the corners.
there are three angles on an isosceles triangle
No. An isosceles right triangle is a special case. There are many right triangles which are not isosceles.
3 and 3 I believe
In an isosceles triangle, two of the angles are the same.