1
The point where the three "altitudes" of a triangle meet.
2
is a triangle in which all three sides have the same length.
3
is the point of intersection of its medians (the lines joining each vertex with the midpoint of the opposite side).
4
is a triangle which has two equal sides. Also, the two angles opposite to the two equal sides are equal.
5
is a line segment that bisects one of the vertex angles of a triangle.
6
It is the geometric figure that is formed by joining 3 non-collinear points by line segments.
7
It is where the "angle bisectors" (lines that split each corner's angle in half) meet.
8
is the segment that joins a vertex with the side opposite to said vertex, which is called the base.
9
is a line segment joining a vertex to the midpoint of the opposite side, thus bisecting that side.
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