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Measure & Classify Angles

Measure & Classify Angles. TEKS 6.6B Lesson 2 (4 th 6 Weeks). Measuring Angles using a pictorial representation of a protractor.

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Measure & Classify Angles

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  1. Measure & Classify Angles TEKS 6.6B Lesson 2 (4th 6 Weeks)

  2. Measuring Angles using a pictorial representation of a protractor Step 1: The vertex of the angle to be measured will be located at the center of the base of the protractor. Choosing to read either the inner or outer scale of the protractor, identify the measure where the leftray of the angle crosses the scale.

  3. Step 2:Identify the measure where the right ray crosses the scale. (Use the same scale as step one!) Step 3: Find the difference between the two measures (subtract). This is the measure of the angle! Step 4: Make sure you angle measurement is reasonable!!!!!!!

  4. Step 5: Write the measure of the angle as: m B = 55° which is read “the measure of angle B is 55 degrees”

  5. Types of Angles Right angle: = 90° Acute angle: > 0°, but < 90° Obtuse angle: > 90°, but < 180° Straight angle: = 180°

  6. 106 58 42 AEB = 58 – 42 = 16° BEC = 106 – 58 = 48°

  7. 106 58 135 42 CED = 135 – 106 = 29° AEC = 106 – 42 = 64°

  8. 106 58 135 42 AED = 135 – 42 = 93° BED = 135 – 58 = 77°

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