CK-12 Geometry-Concepts

(Marvins-Underground-K-12) #1

1.1. Basic Geometric Definitions http://www.ck12.org


Use geometric notation to explain each picture in as much detail as possible.


5.


For 6-15, determine if the following statements are ALWAYS true, SOMETIMES true, or NEVER true.



  1. Any two distinct points are collinear.

  2. Any three points determine a plane.

  3. A line is composed of two rays with a common endpoint.

  4. A line segment has infinitely many points between two endpoints.

  5. A point takes up space.

  6. A line is one-dimensional.

  7. Any four distinct points are coplanar.




−→


ABcould be read “rayAB” or “rayBA.”
14.

←→


ABcould be read “lineAB” or “lineBA.”


  1. Theorems are proven true with postulates.


In Algebra you plotted points on the coordinate plane and graphed lines. For 16-20, use graph paper and follow the
steps to make the diagram on the same graph.



  1. Plot the point (2, -3) and label itA.

  2. Plot the point (-4, 3) and label itB.

  3. Draw the segmentAB.

  4. Locate pointC, the intersection of this line with thex−axis.

  5. Draw the ray


−→


CDwith pointD( 1 , 4 ).
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