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Postulate 1-3 is if 2 distinct planes intersect then they intersect in exactly one line, the propeller on the front of the plane shows postulate 1-3.

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Postulate 1-2 is if two distant lines intersect in exactly 1 point, the windmill parts represent postulate 1-2.

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Coplanar points are points that and/or lines that lie in the same plane, the black spots on the soccer ball represent coplanar points.

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Perimeter is the sum of the lengths of a polygon's sides, the arrows below show all sides need to be added to find the perimeter.

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A line segment is a part of a line that consists of one endpoint and all the points of the line on one side of the endpoint, the pencils both have an endpoints on each side.

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Vertical angles are a pair of non-adjacent angles whose sides are opposite rays, pair of scissors shows what a pair of vertical angles looks like.

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A circle is a round figure whose circumference includes points from the center, the marbles below are a circular shape.

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A triangle is a polygon with three edges, the road sign below is in the shape of a triangle.

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A square is a shape that all sides are equal and all angles are right angles, the picture of the dice show the shape of a square.

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A rectangle is a 4-sided shape with straight sides and all interior angles are right angles, the envelope represents the shape of a rectangle.

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A right angle is an angle whose measure is exactly 90 degrees, the pictures frames corners are right angles.

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An obtuse angle is an angle whose measure is bigger than 90 degrees but less than 180 degrees, the hands on the clock represent an obtuse angle.

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An acute angle is an angle whose measure is between 0 and 90 degrees, the bottom left and right of the hanger is an acute angle

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A midpoint divides a segment into two congruent segments, the point on the in the middle of the tennis court represents a midpoint.

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Parallel lines are two lines that are the same length and size and never intersect, in the picture below of the road, parallel lines are represented.

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A line is represented by a straight path that extends in two opposite directions without end and has no thickness, in the picture a line is represented by the shape and direction of the stick.

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Collinear points are points that lie on the same line, in the picture below the straws can have collinear points on it.

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A point indicates a location and has no size, in this picture the middle of the fan is the point.