Perpendicular bisector - A straight line, or a line segment that is perpendicular to a given segment at its midpoint, Angle bisector - A line segment, or line that divides an angle into two congruent adjacent angles., Height  - A straight line, passing by a vertex and perpendicular its opposite side, Median - A line segment joining a vertex of a triangle to the midpoint of its opposite side, Isosceles triangle - A triangle which has two congruent sides (equal sides), Scalene triangle - A triangle in which all the sides are of different lengths and all angles are of different measures.,

Triangles special lines

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