Download February 19, 2014 1 - Plain Local Schools

2-19-14
February 19, 2014
February 19, 2014
1- Fill in your planner
2- Take a MM
3- Return any graded work
4- If you have a make up test you
will be taking it.
5- Lesson 8-2 Classifying angles
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February 19, 2014
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February 19, 2014
8.2 Classifying Angles
Warm Up
Draw each figure.
1. line segment
2. line
3. ray
4. plane
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February 19, 2014
8.2 Classifying Angles
Learn to identify angles and angle pairs.
Vocabulary...
An angle is formed by two
rays with a common endpoint.
The two rays are the sides of
the angle. The common
endpoint is the vertex.
Angles are measured in
degrees (°).
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February 19, 2014
Vocabulary...
An angle’s measure determines the type of
angle it is.
A right angle is an angle that
that measures exactly 90°. The
symbol indicates a right angle.
An acute angle is an angle
that measures less than 90°.
An obtuse angle is an angle
that measures more than 90°
but less than180°.
A straight angle is an angle
that measures 180°.
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Example 1: Classifying Angles
Tell whether each angle is
acute, right, obtuse or straight.
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Check It Out: Example 1
Tell whether each angle is
acute, right, obtuse, or
straight.
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More Vocabulary...
If the sum of the measures of two angles is
90°, then the angles are complementary
angles.
If the sum of the measures of two
angles is 180°, then the angles are
supplementary angles.
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Example 2A: Identifying Complementary and
Supplementary Angles
Use the diagram to tell whether the angles are
complementary, supplementary, or neither.
OMP and
PMQ
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Example 2B: Identifying Complementary and
Supplementary Angles
Use the diagram to tell whether the angles are
complementary, supplementary, or neither.
NMO and
OMR
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Calculate the value of x
x
o
60
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Calculate the value of x
o
20
5x
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Calculate the value of x
o
95 4x + 5
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Example 2C: Identifying Complementary and
Supplementary Angles
Use the diagram to tell whether the angles are
complementary, supplementary, or neither.
PMQ and
QMR
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Angle song
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Lesson Quiz: Part I
Tell whether each angle is acute, right, obtuse, or
straight.
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Practice with measuring
angles using a
protractor.
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Lesson Quiz: Part II
Use the diagram to tell whether the angles are
complementary, supplementary, or neither.
3.
AZB and
BZC
5. Angles M and N are supplementary. If
what is N?
4.
BZC and
M is 117°,
CZD