Warm-up Spend 5 minutes studying for your rules quiz along with looking over your notes from Section 1.1 Objective 1: Check for understanding of rules and section 1.1
Rules Quiz Turn the quiz in when you are finished, make sure to answer all of the questions on the front and back of the quiz
Homework Check
Geometry: Chapter 1 1.2 Points, Lines, and Planes Objective 2: Able to accurately label and define points, lines and planes
Are ideas but do NOT have definition Undefined Terms Point, line, and plane Are ideas but do NOT have definition Used in definitions of other terms
Naming a Point: use one capital Letter Undefined Terms Point: a dot, NO SIZE Naming a Point: use one capital Letter Ex: Name ______
Line: extends forever in 2 directions, NO THICKNESS Undefined Terms Line: extends forever in 2 directions, NO THICKNESS Naming a line (2 ways) Any 2 points on the line with a over the top A single lowercase letter Ex:
Plane: Extends infinitely in all directions along a flat surface Undefined Terms Plane: Extends infinitely in all directions along a flat surface Naming a Plane: (2 ways) Name 3 points on the plane One script capital letter Ex:
Warm-up 9/10 There are 9 points total. There are two intersections of lines Some people dream of success... While others wake up and work hard at it. ~Author Unknown
Objective TLW be able to identify and label points, lines, and planes. TLW define and describe postulate, collinear, and coplanar
Postulate: statements that are accepted true without further justification
Postulate: Two points Determine a line Through any 2 pts there is exactly one _____________ Postulate: Three points determine a Plane Through any 3 points not on a line there is exactly one ________
Examples: Use the figure at the right to: 1) Name 3 points _________ 2) Name 2 lines __________ 3) Name 2 planes _________
Other Terms Collinear: When points can be contained in a single line Ex: YES Are the first 3 points collinear? Second 3? NO
Coplanar: When points are contained in a single plane Note: 3 points will always be coplanar
Examples: Use the diagram at the right to: 1) Name 3 pts that are collinear 2) Name 4 pts that are coplanar 3) Name 3 pts that are NOT collinear G H F E D
Warm-up 9/11 Define postulate, collinear, and coplanar. Provide a counterexample to the statement, ‘the grass is green, then it rained’ Patriotism is easy to understand in America. It means looking out for yourself by looking out for your country. -- Calvin Coolidge
Objective TLW define, label, and name rays and segments
Segments: Naming a segment: Ex: A part of a line that begins at one point and ends at another. Give the endpoints with over the top
Endpoint Endpoint: The points at the ends of a segment
Ray Ray: Naming a Ray: EX: A part of a line that starts at a point (an endpoint) and extends infinitely in one direction. State endpoint first, then another point on ray with on top L A B S K
Drawing Lines, Segments, and Rays Draw three noncollinear points J, K, L. Then draw JK, KL and L J. SOLUTION K L J Draw J, K, and L 1 2 Draw JK. 3 Draw KL. 4 Draw LJ.
Practice A B C 2 D E F G
Practice On your own complete the worksheet
Guided Practice