Welcome to Day 6 of School! Do Now:

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Presentation transcript:

Welcome to Day 6 of School! Do Now: Draw the figure in your notes!

Bell Schedule Today Period Times Length Adv. 7:42-8:28 46 minutes 1 8:31-9:22 51 minutes 2 9:25-10:16 3 10:19-11:10 4 11:13-12:04 5 12:07-12:58 6 1:01-1:52 7 1:55-2:46

What’s a Widget? How did you deduce the answer?

What makes a good definition? How can we use the process of deducing what a widget is to create a good definition? A common format for a definition is: “A ______ is a _______ that _______.” (term) (description) (How is it different)

Can you find a counterexample? What is a counterexample? Should a definition have a counterexample? Ex: “Everyone knows ‘A square is a figure with four equal sides.’” What is wrong with this definition? Sketch a counterexample. Write a better definition for a square.

Try These Define the following terms: Parallel Lines Perpendicular Lines Note the notation for each image

How did you do? Parallel Lines: Lines in the same plane that never meet. Why the same plane? “Lines that never meet” can be skew lines – lines that do not intersect and are noncoplanar. Perpendicular Lines: Lines that meet at 90° angles.

Types of Angles In your group , come up with a definition for the following angles (one at a time) Groups will then have to share their definitions. Then compare your definitions to the “official” definition Right Angle Acute Angle Obtuse Angle Vertical Angle Linear Pair of Angles Complementary Angles Supplementary Angles

Right Angle

Acute Angle

Obtuse Angle

Obtuse Angle

Complementary Angles

Supplementary Angles

Vertical Angles

Linear Angles

Homework Complete the “Lesson 1.3” worksheet.

Exit Slip/Review:

Exit Slip/Review Sketch six points A, B, C, D, E, and F, where no three of which are collinear. Name the line defined by these points. How many lines are there? Sketch six points U, V, W, X, Y, and Z, on four lines such that each line contains three points. How many lines are concurrent at each point?