Technically, triangles don't have tops or bottoms; triangles are rotatable abstractions. Each of the three lines is called a side and each of the three corners is called a vertex. In more friendly real-world terms, if a triangle is oriented with a side at the "bottom", then the "top" is a vertex; in this case one might call the "bottom" the triangle's base and call the corner at the "top" the vertex opposite the base. If a triangle is oriented with a vertex at the "bottom", then the "top" could be a side or it could be another vertex depending upon the exact shape of the triangle.
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triangle
It is called a "triangle" I know, not very imaginative is it?
A triangle with no equal sides is called a Scalene Triangle.
It is an equilateral triangle
To find the height of a triangle you measure it. It has to be from the middle of the base to the top point.