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Geometry Notes Section 1-1

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**What you’ll learn How to identify and model points, lines, and planes**

How to identify collinear and coplanar points and intersecting lines and planes in space.

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**Point-- A point is simply a location**

Draw it with a dot Name it with a CAPITAL printed letter– you only have 26 choices P Fact: It has no shape—no thickness, width, or length—therefore it has no dimension Words/Symbols: point P

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**Collinear points are points that lie on the same line**

Line– made up of points Draw it with arrows Name it with With 2 points on the line a lowercase cursive letter– again 26 choices n A Fact: There is exactly one line through any two points Words/Symbols: Line AB, line BA n AB or BA B Collinear points are points that lie on the same line ↔ ↔

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**Plane—flat surface made up of points**

Draw it with a shaded, slanted, 4-sided figure Name it with With 3 noncollinear points a CAPITOL CURSIVE letter– again 26 choices B A C Fact: There is exactly one plane through 3 noncollinear points Words/Symbols: CAT B T Coplanar points are points that lie on the same plane

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Examples

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**Have you learned? How to identify and model points, lines, and planes**

How to identify collinear and coplanar points and intersecting lines and planes in space. Your assignment is Worksheet 1.1

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Points Undefined term No length, width, or thickness Named with a capital letter.

Points Undefined term No length, width, or thickness Named with a capital letter.

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