1.3.1
1.3 Angles
Vocab:
B
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Angle
Vertex
Side
Interior
1
A
Exterior
On
Protractor
Protractor Postulate ... p. 20
C
• measuring angles ... by absolute value
• measuring angles using protractor
Classifying Angles:
1.
Def Acute: If an angle is acute then the measure of the angle is > 0 and < 90
Converse:
2.
Def Right: If an angle is right then the measure of the angle = 90.
Converse:
3.
Def Obtuse: Converse: If the measure of an angle is > 90 and < 180 then the angle is an obtuse angle.
4.
Def Straight: Converse: If the measure of an angle = 180 then the angle is a straight angle.
⇒ Do 1.3.2
measuring angles worksheet
1
2
1.3.4
3
1.3.5
Adjacent Angles
Experiment
1.
2.
a.
b.
c.
Using a straight edge draw ∠ABC. Draw point D in the interior of ∠ABC. Draw ray BD.
Find the measure of the following:
m ∠ABD = _____
m∠DBC = _____
m ∠ABC = _____
3.
What conclusion can you make? Compare and discuss your results and conclusion with those sitting around you.
4.
Write a statement regarding what you have just done and the findings that you observed. Think and write about what was given and the conclusion that was made.
1.
2.
4.
3.
5.
4
1.3.8
5
1.3.9
6