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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. ZY ZY or YZ.

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Presentation on theme: "Line A straight path that goes on forever in both directions; it is named by any two points on the line. ZY ZY or YZ."— Presentation transcript:

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

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

3 Ray A piece of a line with one endpoint and continues forever in the other direction; its named by its endpoint and another point on the ray R T RT

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

5 Intersecting Lines, segments, or rays that cross each other

6 Perpendicular Lines, segments, or rays that intersect at 90 0 (right) angles

7 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)

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

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

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

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

12 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. A B C X Y Z These triangles are congruent!

13 How Many Degrees in a Triangle? The three angles in a triangle add up to So… if angle A is 90 0, and angle B is 30 0, then angle C will be = 60 0 A C B

14 How Many Degrees in a Quadrilateral? The four angles in any quadrilateral add up to Examples of quadrilaterals:

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

16 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!

17 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!

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

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

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

21 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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