42 Measuring Angles
A) What is the difference between these two?
a.
25
=
∠
ABC
m
ABC
∠
b.
The first one reads as “the measure of
25
=
∠
ABC
degrees”
c.
Turn to page 84 and look at the figure
d. degree
i.
The unit of measure is called a
degree
e. Measure
i.
the number of degrees in an angle
f.
We don’t have to use the degree sign when we write the number in
our notation because the
m
takes care of this:
ABC
m
∠
is the
number
of degrees
in the angle
B) Postulate 11 (The Angle Measurement Postulate)
a.
To every angle
BAC
∠
there corresponds a real number between 0
and 180.
b.
B
A
C
r
BAC
m
=
∠
c. Measure
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i.
The number given by the Angle Measurement Postulate
C) Postulate 12 (The Angle Construction Postulate)
a.
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 Spring '09
 Johnson
 Algebra, Angle Measurement Postulate, 25 degrees, ray AP

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