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A circle is a shape with no straight sides, but one curved edge that is the circumference of the circle. This pizza is an example of a circle.

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A shape with three sides that are either all congruent, two are congruent, or none of them are; they can also be acute, obtuse, or right. This sign is an example of an equilateral triangle.

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A square is a shape with four congruent sides and this clock is an example of a square.

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A rectangle is a shape with two congruent top and bottom lines and to different congruent side lines. This flag is an example of a rectangle.

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Congruent angles are angles that have the same measure and the sides of these two buildings make two congruent acute angles.

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Vertical angles are two angles whose sides form two pairs of opposite rays and these signs are crossed and form opposite rays.

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A straight angle is an angle whose measure is 180º and the wing span of the plane creates a straight line/angle which is 180º.

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A right angle is an angle whose measure is 90º and the corner of the field is clearly a right angle.

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An obtuse angle is an angle whose measure is between 90º and 180º. The hockey stick is curved more than 90º, but is not a straight line.

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An acute angle is an angle whose measure is between 0º and 90º. This alligators mouth is open less than 90º.

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Congruent segments are segments that have the same length and he poles holding up the bridge are all congruent segments.

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Postulate 1-3 says when two distinct planes intersect, they intersect at one line. The walls in the room intersect at a line, in the corners.

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Parallel lines are two lines that are an even distance away from each other and never intersect. This picture shows how each track lane is evenly divided and the lines never intersect each other.

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Postulate 1-2 says when two distinct lines intersect, they intersect in exactly one point. These parking spaces show lines intersecting and crossing at a point to divide the spaces.

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A line is a straight path that extends forever in two directions and the lines on the field do not stance in thickness and are straight.

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Collinear points are points that lie on the same line and these traffic lights all lie on the same pole.

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A point indicates a location and this point indicates the location of a destination on a map.

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Coplanar points are points that lie on the same plane and the chess pieces lie on the same board.