# Lesson 1-1

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## Lesson 1-1

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1. Lesson 1-1 Points, Lines & Planes

2. Points How to sketch: B * dots A How to label: C A * Use capital printed letters. * Never label two points with the same name (in the same sketch).

3. Collinear Points Collinear points are points that lie on the same line. (The line does not have to be visible.) Definition: collinear non-collinear

4. Lines How to sketch: n NEVER * must have arrows at both ends ? ? ? How to label: ? ? ? (Two methods) Possible Names: 1- small “script” letter 2- any two points on the line

5. Planes horizontal “edges” How to sketch: M * horizontal * vertical P N * other How to label: vertical “edges” (Two methods) 1- capital “script” letter 2- any three points on the plane

6. Planes How to label: #2- any three points on the plane

7. Planes How to label: any three points on the plane How many planes do you see?

8. Planes How to label: any three (or more) points on the plane How many planes do you see? plane ABCD plane ABC plane BCD plane CDA plane DAB etc.

9. Planes How to label: any three (or more) points on the plane How many planes do you see? plane EFGH plane EFG plane FGH plane GHE plane HEF etc.

10. Planes How to label: any three (or more) points on the plane How many planes do you see? plane AEHD plane EHD plane HDA plane DAE plane AEH etc.

11. Planes How to label: any three (or more) points on the plane How many planes do you see? plane BFGC plane BFG plane FGC plane GCB plane CBF etc.

12. Planes How to label: any three (or more) points on the plane How many planes do you see? plane ABFE plane ABF plane BFE plane FEA plane EAB etc.

13. Planes How to label: any three (or more) points on the plane How many planes do you see? plane DCGH plane DCG plane CGH plane GHD plane HDC etc.

14. plane AFGD plane ACGE plane ACH Planes How to label: any three (or more) points on the plane Any three points determine a plane! plane AGF plane BDG etc.

15. Coplanar Coplanar objects (points or lines) are objects that lie on the same plane. (The plane does not have to be visible.) Definition: Are they coplanar? ABC ? yes ABCF ? NO HGFE ? yes EHCB ? yes AGF ? yes CBFH ? NO