1. 1.3 What's a Widget?
Warm-Up
pg. 53 # 26, 27, 31 (Hint: start by drawing a figure, then
label, then solve
AB = 12 cm
3
#26
A D C B
A

#27 E
 m<EBC = 36

D
B 24

C

2. 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

3. Creating a Good definition:
 Classify
 Differentiate
 Test (if you can find a conterexample then you need to
redefine the word)
Define these:
1. Parallel Lines
2. Perpendicular lines
3. Skew lines

4. Parallel Lines:
 Lines in the same plane that never meet
Symbol
to show
lines are
parallel
Arrow marks say these lines are parallel
Lines can ALSO be named
by ONE lowercase cursive
letter.
Statement describing the figure:

5. Perpendicular Lines:
 Lines that intersect (cross) at exactly 90 angles
Box indicates 90 (always in corner at vertex)
Symbol for perpendicular lines
Statement for perpendicular Lines:

6. 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

7. Right Angle:
Acute Angle
Obtuse Angle

8. Pair of Complementary Angles Pair of Supplementary Angles
Pair Of Vertical Angles Pair of Linear Angles

9. Solve this problem!

10. Try page 51 to 52 # 1-21 odd