A triangle is joined together by 3 vertices which is the plural of vertex
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Its vertices.
Tri means three, and there are three angles to a triangle so that's how the triangle got its name.
it is a equalatiral triangle
scalene triangle
It impossible for a triangle to have three acute angles. * * * * * What? A triangle most certainly can have three acute angles. Such a triangle would be called an acute-angled triangle!