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A triangle is a polygon with three sides. This traffic cone displays three sides like a triangle.

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Line segments that are equal in length. This latter can indicate congruent segments because the bars to the ladder are equal in length. (tics drawn in by me.)

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A rectangle has four straight sides and four right angles, much like a square. This Hersheys chocolate bar is rectangular not only from its four sides and right angles, but also its unequal adjacent sides.

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A point shown in the middle. This line of gold ribbon has a point right in the center of the bow. This would be the midpoint.

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Coplanar points are points that lie in the same plane. This blue polka-dotted present shows points that lie all on one side of the box.

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A point has no dimension and is represented by a dot. This button on fabric can display a point seeing that it is in one place and can be referred to as a dot.

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Two angles whose sides form two pairs of opposite rays. The floor tiles make up an array of vertical angles. The two angles below are shown mirroring each other. (Lines drawn by me.)

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Lines that form the outside of a plane figure. The square forming around the garden shows off its perimeter.

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These coke bottle caps have a round plane figure which circles have.

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A straight line that extends forever. The straw of this milkshake displays a straight line.

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A line that has two endpoints on each side. This baton twirler's baton has two endpoints on each side, making it a line segment.

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Represented by a flat surface that extends without end. One side of this box can represent a plane because of its flat surface.

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Collinear points are points that lie on the same line. In this picture, the elevator buttons are lined up with one another, thus making them collinear. (Line drawn out by me.)

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An angle that measures exactly 90 degrees. The two lines that make a corner of this photograph displays a right angle.

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If two distinct lines intersect, they intersect in exactly one point. The two lines that make up this crosswalk intersect each other at the point in the middle. (As drawn out by me.)

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An angle that measures between 0 and 90 degrees. This crocodile is opening its mouth at an acute angle. If you take a protractor and measure, you can see that the angle it makes is less than 90 degrees.

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If two distinct planes intersect, then they intersect in exactly one line. The two planes shown by the walls of this building intersect at the middle line.

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An angle that measures between 90 and 180 degrees. My friend is displaying an obtuse angle with her arms. If you measure her arms with a protractor, you would see that it measures more than 90 degrees.