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Each small box in this picture represents a square because a square is a polygon with 4 straight sides and four right angles, all the boxes on the checkerboard have 4 straight sides and 4 straight angles.

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This half of a sandwich represents a triangle because it is a polygon (a closed plane figure) with three sides.

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This tire represents a circle because it is a round plane figure whose boundary is equally distant from a fixed point all the way around, which is exactly what a circle is.

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This picture represents a perimeter because a perimeter is the outside  of a figure, and the white fence is the outside boundary of the figure of the pool.

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These lawn chairs are congruent angles because congruent angles have the same measures, and the measures of angles that the two chairs make are the same.

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This picture of a railroad crossing sign represents vertical angles because they are a pair of non-adajacent angles (not next to) angles whose sides are opposite rays.

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This picture represents a straight angle because the white shelves are exactly 180 degrees, and straight angles are exactly 180 degrees.

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This picture represents a right angle because where the legs of the table and the table top meet, they form perfect 90 degree angles, and a right angle is a perfect 90 degree angle.

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This picture represents an acute angle because the width of the alligator's open mouth is an acute angle as it is smaller than 90 degrees, and an acute angle is smaller than 90 degrees.

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This picture represents an obtuse angle because the slant of the hockey stick is greater than 90 degrees, and an obtuse angle is greater than 90 degrees.

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This picture represents a midpoint because a midpoint divides a segment into two congruent segments, and in this picture the white center of the lemon divides the center line of the lemon into two congruent segments.

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These salt and pepper shakers are congruent segments they are both segments (two endpoints) that are the same length.

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Postulate 1-3 states that if two distinct planes intersect, they intersect at exactly one line, and in this picture the, the front side of the house (one plane) intersects with the side of the house (another plane) and exactly one line which is represented by the white border between the two sides of the house.

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Postulate 1-2 states that if two distinct lines intersect, they intersect at exactly one point, and in this picture the two lines (represented by the two roads) intersect at exactly 1 point (represented by the exactly one road intersection)

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The ten yard lines on this football field are parallel lines because they are coplanar (the plane being the field) and they do not intersect.

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The wide yellow line in the center of the road represents a line because it is a straight path that extends without end in two opposite directions.

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This piece of paper represents a plane because it is a flat surface that extends without end.

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The white dots on the pillows represent points because they indicate a location and have no dimension.