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The sum of the side lengths of a polygon. In the picture it shows the perimeter as the outside fence.

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A circle is the set of the points in a plane that are a fixed distance from a fixed point. In the picture it shows the point and the distance.

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A triangle has 2 congruent sides and 2 congruent base angles. In the picture above it shows the 2 sides and angles.

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A square is a parallelogram with 4 congruent sides and 4 interior 90 degree angles. The picture above shows the 4 congruent sides and 4 angles.

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A rectangle is a shape with 2 pairs of equal parallel opposite sides. In the picture the welcome sign sows the 2 pairs of sides.

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An angle bisector is a line that gets bisected by another line to form an angle. This picture shows the line of the kite and then the bisector and then it shows the right angle that is formed.

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Complimentary angles are 2 angles that are cute that come together to form a right angle. In the picture it shows the acute angles that come together.

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Adjacent angles are 2 angles that don't overlap and they share a common side and a vertex. The picture above shows the common side and the vertex shared.

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Congruent angles are 2 or more angles with equal measures. In this picture each tile is congruent with each other.

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Lines that go up and down are vertical lines. In this picture it shows a series of vertical lines.

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A straight angle is an angle with a measure of 180 degrees. In the picture above all the examples are straight angles and they all open up to 180 degrees.

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A right angle is an angle that measures exactly 90 degrees. In both of these pictures the hands on the clocks both make a right angle.

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An obtuse angle is an angle that measures greater than 90 degrees. In this picture the fan opens up to an angle that is greater than 90 degrees.

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An acute angle is an angle that is less than 90 degrees. This picture the crocodiles mouth opens to an angle smaller than 90 degrees.

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A segment bisector is a line that intersects a line and it bisects the line into parts. In this picture the lines on the dresser bisect the drawers.

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The midpoint is the point on a line that separates it directly in half. In the picture above the midpoint is the middle of the see saw.

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A congruent segment is 2 congruent segments that have the same length. The picture above shows the two segments that are the same length and as well are congruent.

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Parallel lines are lines that don't ever intersect. This picture shows the white lines that will never cross each other.

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A line segment is a part of a line that has 2 defined end points. In this picture a ruler has 2 defined end points.

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A point is the exact location in space or a flat surface. In this picture the point of the pencil is the example because it is the exact location that hits the flat surface of a paper.

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A plane is an endless flat surface. This book shows the flat surface and that's why I chose it as my example. An example also could be a kitchen floor.

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Points belonging to the same plane. In this picture the points are all sharing one plane on the Rubik's cube.

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Points that all fall on the same line and all continue in a straight path. This picture represents how the houses are all in one line which makes them all collinear points.

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A line is a straight path that goes in both directions forever. This picture is an example because the train tracks are straight lines and they go on forever.