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This cracker is a circle because it is round and it consists of points that are equal in distance from the center.

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The yield sign is a triangle because it has three sides.

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The side of this tissue box is a square because it has four sides that are congruent.

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The top of the table forms a rectangle because all of the sides are not equal to each other and the sides opposite of each other are parallel.

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The hands on this clock form complementary angles because between the measurements of the big hand and the second hand and the small hand and the second hand the sum is 90 degrees.

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The window's sides form congruent angles to the window next to it because they have the same measurement.

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The open scissors creates a vertical angle because it forms a pair of non-adjacent angles in which the sides are opposite rays (making an "x" shape).

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The blue colored wood forms a right angle because it is a 90 degree angle.

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The shed's two sides at the top form an obtuse angle because the measure of that angle would be bigger than 90 degrees but less than 180 degrees.

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This piece of pizza is has an acute angle because the measure of the pizza's cut sides would be between 0 to 90 degrees.

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This playground object is an example of a congruent segment because the metal sides of the object are the same shape and size.

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The garage door and driveway are an example of postulate 1-3 because two planes (the garage door and the drive way) intersect in one line, which is where the garage touches the driveway.

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The railroad tracks are parallel lines because they do not intersect and are parallel to each other.

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This road intersection is an example of Postulate 1-2 because two lines (the two roads) intersect at one point.

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The yard lines are line segments because they each have two end points.

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The pencil is a line because it has a straight path that extends in both directions.

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The football fields is a plane because it is a flat surface.

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The chocolate chip is a point because it is one location on the cookie.