grade 5 mathematics measuring different types of angles 45-what do we refer different types of...
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Grade 5 Lesson on Angles.notebook
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November 28, 2015
Grade 5 Mathematics
Measuring Different Types of Angles
45
90 180
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Let's Review!
-What is an angle?
-How do we measure angles?
-What unit of measurement do we use when measuring
angles?
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And the Answer Is...
Angle: "An angle is a geometric figure formed by 2 lines that start at the same point. This point is called the vertex" (Decimals Workbook, p. 29).
-Unit of measurement for angles= A degree
-Symbol=
Example: 45
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Presenting an angle measuring 40 degrees
0 180
10 170
20160
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15040
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0°
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Presenting an angle measuring 90 degrees
0 180
10 170
20160
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15040
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120
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90
90
0°
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Presenting an angle measuring 160 degrees
0 180
10 170
20160
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15040
14050
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90
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0°
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Learning About Different Types
of Angles
Let's Review!
-Are there different types of angles? If so, how many are there?
-What do we refer different types of angles as?"
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Presenting an Acute Angle:
Acute angles measure less than 90 degrees.
0 180
10 170
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90
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0°
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17010
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Presenting a Right Angle:
Right Angles measure exactly 90 degrees.
0 180
10 170
20160
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15040
14050
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120
70
110
80
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90
90
0°
100
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Presenting an Obtuse Angle:
Obtuse angles measure greater than 90 degrees.
0 180
10 170
20160
30
15040
14050
13060
120
70
110
80
100
90
90
0°
100
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70
120
60
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17010
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Presenting a Straight-Angle:
Straight-angles measure exactly 180 degrees.
0 180
10 170
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15040
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13060
120
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110
80
100
90
90
0°
100
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Create an angle measuring 45 degrees.
What type of angle is this? Why?
0 180
10 170
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15040
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110
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100
90
90
0°
100
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What type of angle is this? Why?
Create an angle measuring 175 degrees.
0 180
10 170
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15040
14050
13060
120
70
110
80
100
90
90
0°
100
80
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Create an angle measuring 60 degrees
What type of angle is this? Why?
0 180
10 170
20160
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13060
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70
110
80
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90
90
0°
100
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Create an angle measuring 110 degrees.
What type of angle is this? Why?
0 180
10 170
20160
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15040
14050
13060
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110
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90
90
0°
100
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In your Interactive Math Journal, write the following:
An Acute Angle
Definition:
An acute angle
is an angle that
measures
less than 90 degrees.
Classroom Examples:
Shelf clips,
open window and
scissors
A Right Angle
Definition: A right
angle is an angle
that measures
exactly 90 degrees.
Classroom Examples:
Bookshelves,
Smart Board corners
An Obtuse Angle
Definition: An obtuse
angle is an angle that
measures greater than
90 degrees.
Classroom Examples:
Desk at the back of
the class.
A Straight Angle
Definition: A straight angle is an
angle that measures exactly 180 degrees.
Classroom Examples:
Top of Blackboard
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Estimate the Following Angles
1.
2.
3.
4.
0 180
10 170
20160
30
15040
14050
13060
120
70
110
80
100
90
90
0°
100
80
110
70
120
60
130
50
140
40
150
30
16020
17010
1800
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