The document discusses angles, including defining an angle as being formed by two rays with a common endpoint, called the vertex. It explains how to name angles by the vertex alone or by the vertex and two points, and shows examples of drawing and measuring angles using a protractor. Students are instructed to work on problems identifying and drawing angles of various degrees in their groups.

1. 9.2 ­ Angles
Objective: Name, measure, and
draw angles.
Mr. Williams
GESD
jwilliams@gesd40.org
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2. Angle
Formed by two
rays with the
same endpoint.
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3. Vertex
The endpoint of
the rays that form
the angle.
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4. A B
Naming Angles
You can name an angle by its
vertex.
B C
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5. A B
Naming Angles
You can name an angle by its
vertex and two points.
ABC CBA
C
The vertex is always in the
middle.
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6. Your Turn:
With your group work on
pg. 425 problems 1 ­ 3
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7. Using a Protractor
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8. Your Turn:
With your group draw angles
with the following degrees:
o o o o o o
60 , 75 , 35 , 90 , 115 , 170
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