It is the vertex whose plural is vertices
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BiAngle, two lines leave from point A on a sphere and after 180 degrees they meet on point B <><><><> However, by definition, a triangle will always have THREE sides.
Never, there are no true "opposite sides" on a triangle as each side intersects the other two at a point. Were two of the lines parallel, the triangle would be missing a point and would not be a closed shape.
Scalene Triangle: a triangle with no two sides equalIsosceles Triangle: a triangle with two sides equalEquilateral Triangle: a triangle with all sides equalRight Triangle: A triangle with two 'legs' vertex creates a 90o angle.
An isosceles triangle has two equal sides
Scalene Triangle- a triangle with no congruent sides Isosceles Triangle- a triangle with two congruent sides Equilateral Triangle- a triangle with three congruent sides