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total length of its boundary
The outside of a soccer field would be a perimeter.

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a three-sided polygon that consists of three edges and three vertices.
A dorito chip is a triangle because it is three sided

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a round-shaped figure that has no corners or edges
A plate is a circle because it has no corners or edges.

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a plane figure with four equal straight sides and four right angles.
the side of a tissue box is a square because it has four equal sides.

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A ray that divides an angle into 2 congruent angles

a large slice of a pizza cut into equal pieces is an angle bisector because it creates two congruent slices.

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A pair of coplanar angles with a common side, common vertex, and NO common interior points
mercedes benz logo

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If a line intersects another line at the midpoint, it is called a segment bisector.

The big thing that comes up from a bridge is a segment bisector because it intersects it at the midpoint.

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A midpoint divides a segment into 2 congruent segments.

The thing in the middle of the seesaw is a midpoint because it is in the middle of the two seats where the people go.

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lines that do not intersect or meet each other at any point in a plane.
A railroad track are parallel because they never intersect and they keep going straight.

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A pair of angles whose measures add up to 180 degrees

stairs are supplementary

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A pair of angles whose measures add up to 90 degrees

A ladder is complementary because it adds up to 90 degrees.

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Figures that have the same shape and size

Two NFL footballs are congruent because all of them are made with the same shape and size

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A pair of non-adjacent angles whose sides are opposite rays
A fan is vertical angles because the fans are opposite rays.

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An angle whose measure is exactly 180 degrees

The surface of a table is a straight angle because it is flat.

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An angle whose measure is bigger than 90 but less than 180 degrees
A sun chair is an obtuse angle because it is going back

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An angle whose measure is exactly 90 degrees

A clock that is at 3 pm is a right angle because it is exactly 90 degrees.

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An angle whose measure is between 0 and 90, but not including 90

A laptop that is halfway closed is an acute angle because it is between 0-89 degrees

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if 2 distinct planes intersect, then they intersect in exactly 1 line

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If two distinct lines intersect, then they intersect in exactly 1 point.

scissors are postulate because the the blades intersect each other

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A part of a line that consists of two endpoints and all the points in between them

A straw is a segment because it has two endpoints.

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Represented by a straight path that extends in 2 opposite directions without end and has no thickness.

A pencil is a line because it extends out from both sides

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Points and/or lines that belong in the same plane
A front cover of a book is coplanar because all of the edges/points are all on the same plane

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Points that belong on the same line
Rings on a shower curtain are colinear points because they are on the same pole.

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Represented by a flat surface that extends without end and has no thickness.

The floor is a plane because it extends out and doesn't have thickness.

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Indicates a location and has no size.
The red circle on the dartboard is a point because it indicates a location