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## Lesson 1-3

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**Lesson 1-3**Postulates**Ohio Content Standards:**• Formally define geometric figures. • Establish the validity of conjectures about geometric objects, their properties and relationships by counter-example, inductive and deductive reasoning, and critiquing arguments made by others. • Make, test and establish the validity of conjectures about geometric properties and relationships using counterexample, and inductive and deductive reasoning.**Review:**• Postulate 1-1 :**Review:**• Postulate 1-1 : • Two points determine a unique line.**Review:**• Postulate 1-2 :**Review:**• Postulate 1-2 : • If two distinct lines intersect, then their intersection is a point.**Review:**• Postulate 1-3 :**Review:**• Postulate 1-3 : • Three noncollinear points determine a unique plane.**As shown below, points K, L, and M are noncollinear.**• Name all of the different lines that can be drawn through these points. K M L**As shown below, points K, L, and M are noncollinear.**• Name all of the different lines that can be drawn through these points. • Name the intersection of KL and KM. K M L**Name all of the planes that are represented in the prism.**Name all of the planes that are represented in the prism. A B E F C D G H**Review:**• Postulate 1-4 :**Review:**• Postulate 1-4 : • If two distinct planes intersect, then their intersection is a line.**The figure shows the intersection of six planes.**G F H E C D B A**The figure shows the intersection of six planes.**G F H E C D B A Name the intersection of plane ABC and plane DEF.**Assignment:**Pgs. 21 & 22 10-30 evens