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Line A straight path that goes on forever in both directions; it is named by any two points on the line. Z Y ZY or YZ

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**A piece of a line with two endpoints; it is named by its endpoints**

Line Segment A piece of a line with two endpoints; it is named by its endpoints A B AB or BA

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Ray A piece of a line with one endpoint and continues forever in the other direction; it’s named by its endpoint and another point on the ray R T RT

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Parallel Lines, segments, or rays that are always the same distance apart and NEVER intersect

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**Lines, segments, or rays that cross each other**

Intersecting Lines, segments, or rays that cross each other

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**Lines, segments, or rays that intersect at 900 (right) angles**

Perpendicular Lines, segments, or rays that intersect at 900 (right) angles

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**(THINK…car on the bridge compared to a boat on the water)**

Skew Lines, segments, rays that will never intersect because they are in different planes (THINK…car on the bridge compared to a boat on the water)

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Angle Two rays that share the same endpoint; measured in degrees (from 0 to 3600) How to name this angle: M J K KJM J MJK

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**The point where 2 rays meet to form an angle**

Vertex The point where 2 rays meet to form an angle Y Vertex Q N

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**A point that lies inside the two rays of an angle**

Interior Point A point that lies inside the two rays of an angle C

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**A point that lies outside the two rays of an angle**

Exterior Point A point that lies outside the two rays of an angle B

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Congruent Objects that are exactly the same shape and size. When 2 shapes are exactly the same, then their parts (sides, angles, etc.) are the same. B Y These triangles are congruent! X A Z C

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**How Many Degrees in a Triangle?**

The three angles in a triangle add up to 1800. So… if angle A is 900, and angle B is 300, then angle C will be = 600 C B A

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**How Many Degrees in a Quadrilateral?**

The four angles in any quadrilateral add up to 3600. Examples of quadrilaterals:

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Circle A flat, closed curve where every point on the edge is the same distance from the center center

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Radius A straight segment drawn from the center of a circle to a point on the outside edge; half the diameter **There are an infinite # of radii in a circle!

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Diameter A straight segment drawn from one side of a circle to another THROUGH the center; twice the radius **There are an infinite # of diameters in a circle!

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Circumference The distance around the edge of a circle found by multiplying Pi (or Π) by the diameter C = Π x d

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Pi (or Π) Ratio of the circumference of a circle to the diameter; Every circle’s circumference divided by its diameter is Π Approximately 3.14

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Prism A 3-D shape with 2 congruent bases; all other faces are rectangles Prisms are named by the shape of their bases Square prism Triangular prism

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Pyramid A 3-D shape with one base and 3 or more triangular sides that meet at a vertex; pyramids are named by their base Square base, so this is a square pyramid

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