9/12 Bell Ringer Step 1: Name angles 1, 2, 3 and 4 in three different ways each. D G C R A B S X

9/12 News and Notes Syllabus Status Exit Slip Grades Announcements: Quiz 1.1 on Friday –Covering all material up to this point

9/12 Agenda SWBAT identify collinear and coplanar points, parallel and perpendicular lines. -Do Now Review -Exit Slip Review 1.General Word Knowledge 2.1 Example – Writing geometry sentences 3.Guided Practice – Convert the following to geometry sentences! 4.Independent Practice

New Material Today we will talk more about point and line relationships in 2-D space. What does it mean for two teachers to be coworkers? –Work together –Work on the same projects, do similar things.

New Material, cont. Based on your understanding of what a coworker is, write down your own definition of what it means for 2 points to be collinear: –2 points are collinear if they’re on the same line. Now write down what you think it means for two points or lines to be coplanar: –2 points or lines are coplanar if they’re in the same plane.

New Material, cont. Now think back to the Chicago Map. Recall that it is set up like a coordinate plane. Do Ashland and Loomis ever intersect (cross each other)? So what are they? –PARALLEL LINES NEVER INTERSECT

New Material, cont. What about Roosevelt and Loomis? How do they intersect? –They intersect at right angles Two angles that intersect at a 90° angle are PERPENDICULAR LINES.

1 Example Give examples of: Collinear points Coplanar points Non-collinear points Non-coplanar points A D B C E GF H KJ X R

1 Example Give examples of: What lines are // ? EF // HJ What lines are ? EF GK and HJ GK A D B C E GF H KJ X R

Now write a sentence that details the relationship between elements EF and HP In words: EF is parallel to HP In math notation: EF // HP A D B C E R F H KP O T

Now write a sentence that details the relationship between elements EF and RK In words: EF is perpendicular to RK In math notation: EF RK A D B C E R F H KP O T

Now write a sentence that details the relationship between elements R and H R and H are coplanar T and K T and K are noncoplanar H and K H and K are collinear A D B C E R F H KP O T P and E P and E are noncollinear

Independent Practice You now have time now to work on the Independent practice portion of the work.

EXIT SLIP Answer on a sheet of loose leaf L M J K N O P S Q R T 1.) Give an example of perpendicular lines, using geometric notation. 2.) What is the relationship between points O and P? 3.) Describe the relationship between points K and O (hint: there are two answers for this). 4.) Which lines are parallel to each other? (Use geometric notation to describe. 5.) What type of angle is formed at a perpendicular intersection?