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Chord

A segment inside the circle which has end points on the sides of the circle.

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Hexagon

a polygon with six sides

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180

Total measure the angles in every triangle.

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Rhombus

A quadrilateral, parallelogram with 4 congruent sides

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Scalene

A triangle with NO sides congruent

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Square

A quadrilateral, parallelogram with 4 congruent sides and 4 right angles

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Supplementary

Angles whose sum is 180

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Straight

An angle that measures exactly 180

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Obtuse

An angle that measures between 90-180

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Nonagon

A polygon with 9 sides

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Line

A series of points that extends indefinitely in both directions

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Right

An angle that measures exactly 90

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Right Triangle

A triangle with1 right angle

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Regular Polygon

A polygon with ALL sides congruent and ALL angles congruent

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Ray

Part of a line that extends indefinitely in ONE direction with ONE end point

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Parallel lines

Lines that NEVER intersect

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Rectangle

A quadrilateral, parallelogram with 4 right angles

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Equilateral

A triangle with 3 congruent sides

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Triangle

A polygon with 3 sides

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Skew lines

Lines that are NOT in the same plane, that are NOT parallel, and do NOT intersect

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Radius

A segment that connects the center of the circle to any point on the edge of the circle

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Trapezoid

A quadrilateral with exactly ONE pair of parallel sides.

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Diameter

A chord that crosses through the center of the circle

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Complementary

Angles whose sum is 90

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Decagon

A polygon with 10 sides

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Congruent Sides

Sides that are equal

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Congruent Angles

Angles with equal measures

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Acute

An angle that measures between 0-90

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Parallelogram

A quadrilateral with 2 pairs of parallel lines

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Octagon

A polygon with 8 sides

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Semicircle

An arc that is exactly half of the circumference; use the diameter as a side

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Acute Triangle

has 3 Acute angles

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Segment

Part of a line with 2 endpoints

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Vertical

Angles that are across from each other; they share a vertex only

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Circle

A series of points equidistant from a given point, the center; NOT A POLYGON

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Heptagon

A polygon with 7 sides

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Obtuse Triangle

A triangle with 1 obtuse angle

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Pentagon

A polygon with 5 sides

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Vertex

The intersection of two segments or rays

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Plane

A flat surface that extends indefinitely in all directions

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Point

Indicates a location

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Quadrilateral

Any Polygon with 4 sides

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Adjacent

Angles that are next to each other; share a side and vertex

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Intersecting lines

lines or segments that have one point in common; they cross over each other

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Angle

Formed by the intersection of two rays or segments

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Irreagular Polygon

When all sides and angles are NOT congruent

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Arc

Outside portion of a circle between two points

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Isosceles

A triangle with 2 congruent sides

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Central Angle

An angle inside the circle that has the center of the circle as a vertex of the angle

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