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A dot or single unconnected object on anything. This inky dot is a point on this paper.

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Points on the same line are collinear. The houses on the same street are collinear.

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The perimeter of an object is the distance around the object. The pool has a perimeter around it.

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A circle is a shape that has 0 lines, the same amount of length and width, and adds up to 360 degrees. This plate is a circle because it is round, has 2 dimensions, and has the same amount of length and width.

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A rectangle is a shape that has 4 sides, 2 sets of parallel lines, adds up to 360 degrees, but the sides don't have to all be equal. This I-Pad is a square because it has 2 parallel short lines and long lines.

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Any shape that has 4 equal sides, adds up to 360 degrees, has 2 sets of parallel lines, and is straight. This grid paper has a lot of perfect square grids with 4 sides, and adds up to 360 degrees.

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Any shape with 3 sides that adds up to 180 degrees. This binder is a triangle because it has 3 sides and adds up to 180 degrees.

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Angles that combine and add up to 180 degrees. This book has pages that are up and angles, and they add to exactly 180 degrees, forming a linear pair.

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Angles that combine and add up to 90 degrees. This clock has 3 lines that add up to 90 degrees, the hour hand, minute hand, and second hand, each making up an angle when put together.

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A line that stops at both ends. These sticks have 2 main ends to them.

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An angle measuring exactly 180 degrees. This book's angle is exactly 180 degrees, and it's straight.

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An angle measuring more than 90 degrees but less than 180 degrees. This bent chair has an angle of more than 90 degrees but less than 180 degrees.

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An angle measuring exactly 90 degrees. This chair has an angle of 90 degrees.

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An angle measuring less than 90 degrees. This alligator has a mouth that's less than 90 degrees open.

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A point existing in the middle of a line. The sign is the midpoint between the 2 sides of the road.

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A line having 2 ends that goes on forever. This road is endless on both sides, meaning it never reaches a dead end.

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Points existing on the same plane. These objects are existing on the same table.

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Lines that never intersect