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# 3rd 6 Weeks test rev

### 1st semester Geometry Review

TermDefinition
altitude A segment in a triangle that goes from a vertex perpendicular to the opposite side of the triangle.
perpendicular bisector A segment that is both perpendicular and bisects a segment.
median A segment in a triangle that goes from a vertex to the midpoint of the opposite side.
Perpendicular lines Lines that form right angles.
midpoint A point that divides a segment into two congruent segments.
Segment bisector A line, line segment, point or ray that divides a segment into two congruent segments.
angle bisector A line, line segment, or ray that divides and angle into two congruent angles.
pentagon A polygon with five sides.
Reflexive property AB ≅ AB
Regular polygon A polygon with all sides congruent and all angles congruent.
proof The process of establishing validity.
scalene triangle A triangle where no sides are congruent.
Isosceles triangle A triangle with exactly two sides congruent.
equilateral triangle A triangle with three congruent sides.
equiangular triangle A triangle with three congruent angles.
hypothesis The “if” part of a conditional statement
Conclusion The “then” part of a conditional statement.
octagon A polygon with eight sides.
decagon A polygon with ten sides.
Collinear Points on the same line.
Coplanar Points on the same plane.