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A round plane figure whose boundary consists of points equidistant from a fixed point (the center)

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A polygon with 3 sides

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Polygon with 4 equal sides and 4 right angles

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Polygon with 4 straight sides and 4 right angles, with unequal adjacent sides.

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A point, ray, line, line segment, or plane that intersects the segment at its midpoint.

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Supplementary Angles that also form a linear pair- Road

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Supplementary Angles that also form a linear pair- Road

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Supplementary angles have a measure of 180 degrees. This road is a linear pair and has a measure of 180 degrees

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An angle that has 90 degrees. This chair has an angle of 90 degrees

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Two angles that share a common vertex and side, but have no common interior points. The way that the orange is sectioned makes it an adjacent angle.

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Angles with the same measure. All the triangles in the kite have the same measures

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Vertical Angles- Rail Road crossing signs

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Vertical Angles- Rail Road crossing signs

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two angles are vertical angles if their sides form 2 pairs of opposite rays. The signs has vertical angles on all side of the sign.

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A straight angle is an angle that measures 180 degrees. The edge of a ladder makes an angle that measures 180 degrees.

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A right angle is an angle that measures 90 degrees. This sandwich is cut at a 90 degree angle which makes it a right triangle

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An obtuse angle is an angle that measures between 90 and 180. This lounge chair makes an obtuse angle because of the way it is set up.

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An acute angle is an angle that measures between 0 and 90 degrees. The way this watermelon is cut makes it an acute angle

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An angle bisector is a ray that divides an angle into 2 angles that are congruent. The middle hand of the clock is dividing the other 2 hands, making it an angle bisector.

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A midpoint is the point that divides a segment into 2 congruent segments. A seesaw has a midpoint that splits it into 2 sections

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congruent segments- Playground equipment 

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congruent segments- Playground equipment 

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Congruent segments are lines that have the same lengths. In this picture, all the lines are the same lengths and size

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Two distinct planes intersect then they intersect in exactly one line

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Parallel lines are lines that don't intercept and are coplanar. The Lines on the football field don't intercept and are also coplanar.

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If 2 lines intersect then they intersect in exactly one point

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A line segment is a part of a line that has two endpoints and is finite in length. A ruler is a line that has 2 endpoints.

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A line extends forever in both directions and is represented by a line with two arrow heads. Street lines look like lines.

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Coplanar points are points that lie on the same plane. The chocolate chips in a chocolate chip cookie are all different points in the same plane.

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Collinear Points- Rings on a shower curtain 

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Collinear Points- Rings on a shower curtain 

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Collinear points are points that lie on the same line. The rings on the shower curtain are all on the same line.

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A plane two dimensions, is represented by a shape that looks like a floor or wall, and extends without end. A whiteboard could extend without end, and it also resembles a shape that looks like a floor or wall.

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A point has no dimension and is represented by a dot, the tip of a pencil looks like a point.