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8.1 Building Blocks of Geometry

8.1 Building Blocks of Geometry. 6.4.2 I can describe figures by using the terms of geometry. Vocabulary. point line plane line segment ray. U. V. T. W. S. Use the diagram to name the geometric figure. A. three points. B. two lines. B. A. C.

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8.1 Building Blocks of Geometry

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  1. 8.1 Building Blocks of Geometry 6.4.2 I can describe figures by using the terms of geometry

  2. Vocabulary point line plane line segment ray

  3. U V T W S Use the diagram to name the geometric figure. A. three points B. two lines

  4. B A C Use the diagram to give a possible name to the figure. A. three different line segments B. three ways to name the line

  5. Possible answer: AD, CE 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

  6. 8.2 Measuring and Classifying Angles 6.4.2 I can name, measure, draw, and classify angles

  7. Vocabulary angle vertex acute angle right angle obtuse angle straight angle

  8. Reading Math Right angles are usually marked with a symbol. An acute angle measures greater than 0° and less than 90°. A right angle measures exactly 90°.

  9. An obtuse angle measures greater than 90° and less than 180°. A straight angle measures exactly 180°.

  10. Additional Example 3: Classifying Angles Classify each angle as acute, right, obtuse, or straight. A. B. The angle measures exactly 90°, so it is a right angle. The angle measures less than 90°, so it is an acute angle.

  11. Check It Out: Example 3 Classify each angle as acute, right, obtuse, or straight. A. B. The angle measures exactly 180°, so it is a straight angle. The angle measures less than 90°, so it is an acute angle.

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