# Lesson 1 1 Points Lines Planes Points How

• Slides: 15

Lesson 1 -1 Points, Lines & Planes

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

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

Lines How to sketch: n * must have arrows at both ends ? ? ? How to label: (Two methods) 1 - small “script” letter 2 - any two points on the line Possible Names:

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

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

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

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.

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.

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

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.

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.

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.

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

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