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Acute Angle

Angle measuring less than 90 degrees

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Obtuse Angle

Angle measuring more than 90 degrees

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Right Angle

Angle measuring exactly 90 degrees

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parallelogram

a quadrilateral with opposite sides parallell

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Trapezoid

a quadrilateral with exactly one pair of parallel sides

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collinear

lying on the same line

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coplanar

lying on the same plane

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point, line, plane

Building blocks of Geometry, undefined terms

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line segment

two points (the endpoints) all the points between them that are on the line containg them.

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congruent segment

segments that have the same measure

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midpoint

a point ON a line segment that is equally distant from both endpoints.

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ray

all points on a line that lie on one side of a point (the ray's endpoint).

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congruent angles

angles that have the same measure

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angle

formed by two rays that share an endpoint so long as they do not overlap

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angle bisector

a ray that shares the vertex of the angle and divides the angle into two congruent angles.

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degrees

the unit in which angles are measured

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Vertical Angles

formed by intersecting lines and do not share a common/adjacent side.

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Linear Pair of Angles

a pair of angles that share a side and their non-shared side form a straight line (they are supplementary)

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supplementary angles

two angles whose sum is 180 degrees

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complimentary angles

two angles whose sum is 90 degrees

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polygon

closed figure in a plane, formed by connecting line segmenst endpoint to endpoint with each segment intersecting exactly two others.

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diagonal

a line segment that connects two NON-consecutive vertices

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congruent polygons

polygons that have exactly the same size and shape.

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equilateral polygon

polygon that has all equal sides

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equiangular polygon

polygon that has all equal angles

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regular polygon

polygon that has all equal angles AND sides

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right triangle

a triangle with exactly one right angle

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actue triangle

a triangle with all angles less than 90 degrees

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obtuse triangle

a triangle with exactly one obtuse angle

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scalene triangle

a triangle with no equal sides

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equilateral triangle

a triangle with all equal sides

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isosceles triangle

a triangle with two OR MORE equal sides

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rhombus

a parallelogram with equal sides

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square

a parallelogram with equal angles and sides. (a regular quadrilateral)

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kite

a quadrilateral that has two pair of distinct, consecutive congruent sides

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circle

set of all points in a PLANE that are a give distance from a given point

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diameter (of a circle)

a line segment containing the center of a circle, with endpoints that lie on the circle

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radius

a segment from the center of a circle to a point on the circle.

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concentric circles

circles that share a center

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congruent circles

circles that have the same radius

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semicircle

an arc of a circle whose endpoints are on the diameter

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minor arc

an arc that is smaller than a semicircle (name with 2 letters)

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major arc

an arc that is larger than a semicircle (name with 3 letters)

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central angle

an angle whose vertex is at the center of a circle

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chord

a segment with both of its endpoints on the circle

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tangent

a line that intersects a circle exactly once

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Point of tangency

point where a tangent line intersects a circle

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measure of an arc

equivalent to the measure of it's central angle

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