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Lines in a plane which do not cross. Road lines could be considered parallel lines because they never intersect.

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A point with all points the same distance from it's center. The top or bottom of a hockey puck could be considered a circle.

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A quadrilateral with four right angles. A tennis court can be considered a rectangle because it has four sides and four right angles.

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A polygon with three edges and three vertices. A thing of cheese could be considered a triangle if it is cut to have three edges and three vertices.

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A square is a regular quadrilateral, containing four equal side and four equal angles. A post-it note could be considered a square because they have four equal sides and four equal angles.

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The total distance around the edge of a figure. Any object should technically have a perimeter, like a wheel, or a house, etc.

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Congruent segments are segments that have the same length. A crosswalk could be considered a congruent segment because they all have the same length.

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A midpoint divides a segment into two congruent segments. A ruler also has a midpoint, which divides into two segments.

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If two planes intersect then they intersect in exactly one line. Two stairs could be considered to have Postulate 1-3 because the top of one stair and the side of one stair are both planes that intersect at the corner of the stair.

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If two lines intersect, then they intersect in exactly one point. A TV could also be considered to have Postulate 1-2 because the two sides intersect at one point.

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An angle who's measure is more than 90 but less than 180 degrees. The arms of a windmill could be considered an obtuse angle.

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An angle who's measure is between 0 and 90 degrees, but not including 90º. Cooking tongs could be considered acute angles because it can never create a 90º angle.

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An angle whose measure is exactly 180º. The edge of a ruler could be considered as a straight angle because it has a straight edge.

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An angles whose measure is exactly 90º. The corner of a TV could be considered a right angle because it is in the shape of a rectangle.

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A straight path that extends in two opposite directions without end. A lamp could be considered a line because the pole which extends in two directions.

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Points that lie in the same plane. The buttons on a calculator could be considered coplanar points because they are all on the same surface.

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Represented by a flat surface that extends without end and has no thickness. The top of a cutting board could be considered a plane because it is a flat surface.

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A point indicates a locations and has no size. The hole on the side of a piece of paper could be considered a point because it indicates some sort of location.