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point

a location on a plane or in space

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Line

The set of all points on a plane in a single path that continues in opposite directions

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Plane

The set of al points on a flat surface that extends in all directions

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Line segment

Part of a line; Named by two endpoints.

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Ray

The set of all points in a single path beginning at an endpoint and continuing in one direction

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Angle

The joining of two rays to a common endpoint

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Vertex

Endpoint of the angle

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Acute

An angle that measures between 0 and 90 degrees

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Right

An angle that measures 90 degrees

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Obtuse

An angle that measures between 90 and 180 degrees

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Straight

An angle that measures 180 degrees

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Reflex

An angle that measures more than 180 degrees

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Complementary

Two angles whose measures add up to 90 degrees are ____________.

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Supplementary

Two angles whose measures add up to 180 degrees are _________.

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Vertical

Angles that are nonadjacent that are formed when two lines intersect are __________ angles.

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Parallel

Two lines on the same plane that will never intersect are __________ lines.

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Corresponding

_________ angles are formed when a transversal cuts two or more other lines; They are on the same side of the transversal on the same side of the parallel line that forms each angle.

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Alternate interior

Formed when a transversal cuts two or more lines; Opposite sides of the transversal, but on the einterior of the parallel lines.

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Alternate Exterior

Opposite sides of the transversal on the exterior

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Perpendicular

lines that meet to form right angles are _________.

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Scalene

A triangle whose sides are each different lengths

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Isosceles

A triangle in which two sides have the same measure

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Equilateral

A triangle that has three congruent sides

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Acute

a triangle with three acute angles

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Obtuse

A triangle with one obtuse angle and two acute angles

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Right

A triangle that contains one right angle and two acute angles. The two acute angles are complimentary.

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Isosceles right

A triangle with two congruent sides, a right angle, and two acute angles that are equal in measure.

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Scalene right

A triangle that contains sides each with different lengths, a right angle, and two acute angles that are complimentary, but not necessarily congruent.

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Isosceles obtuse

A triangle that has two congruent sides, an obtuse angle, and two congruent acute angles.

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Isosceles acute

A triangle that has two congruent sides and each of the angles is acute. The two acute base angles are congruent.

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Similar figures

Figures that have the same shape, but not necessarily the same size

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Similar

Triangles that have corresponding sides, or sides that line up, that are in proportion to each other are ________ triangles.

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