Warm-Up

pg. 53 # 26, 27, 31 (Hint: start by drawing a figure, then label, then solve

#26

A BCD

3AB = 12 cm

#27

A

B

C

D

E

24

m<EBC = 36

1.3 What's a Widget?

1.3 What is a Widget? pg. 47 to 5 4

----Do NOT get hung up on the name.

A widget is a madeup word to illustrate a concept---

it is just a definition based on what you see in front of you and it is TRUE all the time....

AND there are no counterexamples to it

Creating a Good definition:

Classify Differentiate

Test (if you can find a conterexample then you need to

redefine the word)

Define these:

1. Parallel Lines2. Perpendicular lines3. Skew lines

Parallel Lines:

Lines in the same plane that never meet

Symbol to show lines are parallel

Arrow marks say these lines are parallelLines can ALSO be named by ONE lowercase cursive letter.

Statement describing the figure:

Perpendicular Lines:

Lines that intersect (cross) at exactly 90 angles

Symbol for perpendicular lines

Box indicates 90 (always in corner at vertex)

Statement for perpendicular Lines:

Complete Investigation

Defining Angles pg. 49 IN GROUPS

The best way to understand is to try YOURSELF, then TRY AGAIN.

You will learn more and REMEMBER more if you figure it out yourself

You won't realize this now--but TRUST ME-or ask a Junior

Right Angle:

Acute Angle

Obtuse Angle

Pair of Complementary Angles Pair of Supplementary Angles

Pair of Linear AnglesPair Of Vertical Angles

Solve this problem!

Try page 51 to 52 # 1-21 odd