8.1 Building Blocks of Geometry
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Transcript of 8.1 Building Blocks of Geometry
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6.4.2 I can describe figures by using the terms of geometry
8.1 Building Blocks of Geometry
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Vocabulary
pointlineplaneline segmentray
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Use the diagram to name the geometric figure.
A. three points
B. two lines V
S
U
WT
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Use the diagram to give a possible name to the figure.
A. three different line segments
B. three ways to name the line
C
A B
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Lesson Quiz
Use the diagram to name each geometric figure.
1. three points
2. two lines
3. a point shared by a line and a ray
4. a plane
Possible answer: A, B, C
Possible answer: F
Possible answer: plane AEC
Possible answer: AD, CE
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6.4.2 I can name, measure, draw, and classify angles
8.2 Measuring and Classifying Angles
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Vocabulary
anglevertexacute angleright angleobtuse anglestraight angle
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An acute angle measures greater than 0° and less than 90°.
A right angle measures exactly 90°.
Right angles are usually marked with a symbol.
Reading Math
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An obtuse angle measures greater than 90° and less than 180°.
A straight angle measures exactly 180°.
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Additional Example 3: Classifying Angles
Classify each angle as acute, right, obtuse, or straight.
A. B.
The angle measures less than 90°, so it is an acute angle.
The angle measures exactly 90°, so it is a right angle.
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Check It Out: Example 3
Classify each angle as acute, right, obtuse, or straight.
A. B.
The angle measures less than 90°, so it is an acute angle.
The angle measures exactly 180°, so it is a straight angle.