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The railroad crossing sign is a vertical angle because it has two angles that form two pairs of opposite rays.

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The hanger shows a triangle because it is a polygon with three sides.

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The horizon measures 180º showing a straight angle.

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The waffles are polygons with four equal sides and four right angles, making it a square.

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The edge of a baseball field forms at a 90º angle, making it a right angle.

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The mirror is a polygon with four straight sides and four right angles, with unequal adjacent sides making it a rectangle.

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The sides of the house are two distinct planes that intersect in one line, which shows postulate 1-3.

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The railroad tracks are two lines that intersect at one point, which shows postulate 1-2.

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The center of the target is a point.

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The fencing around the garden shows perimeter because it goes around the whole thing.

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The street lines are parallel because they do not intersect.

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The boomerang is greater than 90º making it an obtuse angle.

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The 50-yard line extends forever in both sides which is a line.

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The flooring is congruent segments because they are line segments that have the same length.

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The two ends of the scissors are congruent angles because they are the same degree, size, and shape.

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The moon is a circle because it is a round figure and is 360º.

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The mercedes sign is an adjacent angle because it has two angles that share a common vertex and side.

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An acute angle is less than 90º and all angles of the watermelon slice are acute.