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Published byIra Fitzgerald Modified over 9 years ago
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Chapter 1 Exploring Geometry: Points, Lines, and Angles in the Plane Section 4 Measuring Angles Objectives: Students will be able to use a protractor to identify and name angles, and construct perpendiculars using a compass.
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Chapter 1Section 4 - Measuring Angles2 Angles are measured in degrees. The symbol m A means “the measure of angle A”. A protractor is a device used to find the measure of an angle. Measuring Angles Center of the protractor. A m A = 65° Click here to watch a video on using a Protractor to measure angles.
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Chapter 1Section 4 - Measuring Angles3 Example 1 Use your protractor to draw an angle that measures 120°. A m A = 120°
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Chapter 1Section 4 - Measuring Angles4 A right angle is an angle whose measure is 90 . An acute angle is an angle whose measure is less than 90°. Types of Angles Right angle symbol 0° < x < 90° x°x°
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Chapter 1Section 4 - Measuring Angles5 An obtuse angle is an angle whose measure is greater than 90° but less than 180°. A straight angle is an angle that measures 180°. Types of Angles 90° < x < 180° x°x° x°x° x = 180°
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Chapter 1Section 4 - Measuring Angles6 Perpendicular Lines Lines, segments, or rays that form right angles are perpendicular ( ). The symbol is read “is perpendicular to”. AB CD A C B D
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