Chapter 1 Points, Lines, Planes and Angles
Chapter 1 Points, Lines, Planes and Angles
Chapter 1 Points, Lines, Planes and Angles
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Geo 9 Ch 1-2.2 3<strong>Chapter</strong> 1 <strong>Points</strong>, <strong>Lines</strong>, <strong>Planes</strong> <strong>and</strong> <strong>Angles</strong>In Geometry we must start with the basics <strong>and</strong> build our ideas using definitions, postulates <strong>and</strong> theorems.We may not assume anything <strong>and</strong> prove every idea to be true.A. Undefined terms: points, lines, planesB. Definitions - State the meaning of a concept. Definintions are reversible. Definitions contain theleast possible amount of information.Ex. If a point cuts a segment into two equal lengths, then it is called a midpoint.If a midpoint is on a segment, then it cuts the segment into 2 equal lengths.C. Postulates or axioms are things we accept to be true. Not necessarily reversible.Ex.A BAB + BC = ACCD. Theorems – things we prove to be trueEx. If you have a rectangle, then the diagonals are the same length.
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