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The sum of the length of a polygon's sides. To find the perimeter of the soccer field, you would need to add all the sides of the rectangle together.

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A round plane figure. The cookie is a circle because it is a round plane with no end.

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A plane figure with three straight sides and three angles. The piece of pie has three straight sides and angles, it is also an acute angle.

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A plane figure with four equal straight sides and four right angles. The window has four equal sides with four right angles.

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A plane figure with four straight sides and four right angles. The card is a rectangle because it has four right angles with four straight sides.

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A ray that divides an angle into 2 congruent angles. The middle line dividing the two pizza slices is an angle bisector.

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A pair of angles whose measurements add up to 180° and also form a linear pair.  The pieces of pizza add up to 180 degrees, or a straight line.

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A pair of angles that measures add up to 90 degrees. The highlighted pizza slice is a right angle.

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A pair of coplanar angles with a common side, common vertex, and no common interior points. The pieces of pizza have a same side, and a common vertex, but no similar interior points.

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Two or more angles that are identical to each other. The pieces of cake are congruent angles because they are the same size and measure to the same angle.

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A pair of non-adjacent angles whose sides are opposite. The X on the windows are non-adjacent angles whose sides are opposite.

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An angle that measures exactly 90°. The wall and the floor meet and exactly 90°.

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An angle that mesures exactly 180°. The open folder measures 180°, or a straight line.

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An angle that measures bigger than 90° but less than 180°. The laptop is an obtuse angle because it is opened more than 90°.

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An angle that measures between 0° and 90° but not including 90.  The door wedge is an example of an acute angle because it measures less than 90°.

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A midpoint divides a segment into two congruent segments. In the same picture, the very middle of the window frame is the midpoint.

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If a line intersects another line at one point, it is called a segment bisector. The horizontal piece of the window frame is the segment bisector of the vertical window frame piece.

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Figures that have the same shape and size. The two donuts in this picture are the same shape and size.

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If two distinct planes intersect, then they intersect in exactly 1 line. The to planes of a pizza box intersect in one line.

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Lines in a plane that are always the same distance apart and never touch. The wood bars on the fence are parallel to eachother.

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If two distinct lines intersect, then they intersect in exactly 1 point. The inside parts of the window frame intersect at one point.

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A part of a line that consist of two end points and all points between them. The vertical segment piece in between the two horizontal window frames is a segment or a line.

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A straight path that extends into opposite directions without end and has no thickness. The strings on the ukulele are lines.

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Points that belong on the same line. All the dots on the line are collinear.

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Points or lines that belong on the same plane. All the points on this map are coplanar.

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A flat surface that extends without end and has no thickness. This picture is a plane because it is a flat surface with no end or thickness.

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A point indicates a location and has no size. The points in this picture shows where certain locations are on the map.