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| consist of two points called endpoints of the segment and all points between them are collinear with the two points. |
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| Begins at a point and extends indefinitely in one direction. |
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| Formed by two rays that share a common endpoint |
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| Lines that meet at a ninety degree angle. |
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| Angles formed by two intersecting lines; they share a common vertex line |
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| Two lines that do not intersect and are noncoplanar. |
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| Angles adding up to 90 degrees |
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| At least one diagonal is on the exterior of the polygon |
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| A quadrilateral with two distinct pairs of consecutive congruent sides |
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| Equilateral parallelogram |
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| Equiangular parallelogram |
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| Line that intersects a circle in two points. |
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| The act of coming to a general conclusion from particular facts |
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| Line intersecting two parallel lines |
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| Line, ray, segment, or plane that passes through the midpoint of a segment and bisects the segment |
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| The point of concurrency for three perpendicular bisectors of a triangle |
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| The point of concurrency for three medians of a triangle (also center of gravity) |
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| Angle that is included between two sides of a triangle. |
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| Corresponding parts of congruent triangles are congruent |
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| Trapezoid whose two nonparallel sides are the same length |
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| Distance from one endpoint of the arc to the other endpoint of the arc |
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| Circles that share the same center and are the same length |
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| The point on the segment that is the same distance from both endpoints |
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| Divides the segment or angle into two congruent segments or angles |
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| A ray that contains the vertex and divides the angle into two congruent angles |
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| Angle measures more than 90 but less than 180 |
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| Lines in the same plane that never meet |
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| All diagonals are on the interior of the polygon |
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| All sides are the same length |
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| All angles are the same measure |
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| Two pairs of parallel sides |
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| Set of all points in a plane at a given distance from a given point in the plane. |
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| Segment whose endpoints lie on the circle. |
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| A line that intersects a circle in exactly one point. |
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| Drawing shows three sides of an object in one view. |
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| Process showing that certain statements follow logically from agreed-upon assumptions and proven facts. |
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