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The sum of the lengths of its sides. The perimeter is the outer lines of the park.

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The set of all points in a plane that are give distance, the radius, from a given point, the center. The moon is a circle because it can be measured and has no sides.

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Is a polygon with three sides. The glass building is a triangle because it has three vertexes.

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Is a parallelogram with four congruent sides and four right angles. The windows on the barn are square because all of the sides are equal to each other.

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Is a parallelogram with four right angles. The doors are rectangles because they consist of four vertexes that add up to 90º.

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Two coplanar angles with a common side, a common vertex, and no common interior points. The beams on the ceiling of the church are adjacent angles because they are next to each other.

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Angles that have the same measure. The pie slices all idenical.

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Two angles whose sides are opposite rays. The railroad crossing sign make two vertical angles that are opposite of each other

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An angle whose measure is 180º. The horizon makes a straight angle because the angle creates line.

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An angle whose measure is 90º. The corners of the buildings make a right angle because it is made up of vertical and horizontal lines..

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An angle whose measure is between 90º and 180º. The drawbridge make and angle greater than 90º when opened.

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An angle whose measure is between 0º and 90º. The bunny's ears make an acute angle because it is less than 90º.

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If two distinct planes intersect, then they intersect in exactly one line. The roofs represent the planes which intersect at the top of the house.

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If two distinct lines intersect, then they intersect in exactly one point. The wires on the bridge intersect at one point.

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A part of a line that contains 2 endpoints and all the points between them.The lines on the sea shell are line segments because they have a beginning point and a end point.

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A straight path that extends forever in 2 opposite directions without end and has no thickness; it contains infinitely many points. The yellow line on the road is a line because it extends forever in two opposite ways.

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Points that lie in the same plane. The dots on the lady bug are coplanar points because that lie on the same wing.

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The point indicates a location and has no size. The point is the yellow dot on the hot air ballon because it indicates the location of the white line.