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Objectives

1.3 Measuring Angles. Objectives. Measure angles with a protractor. Identify and use the Angle Addition Postulate. acute angle complementary angles linear pair of angles obtuse angle right angle supplementary angles. 1.3 Measuring Angles. Glossary Terms. 1.3 Measuring Angles.

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Objectives

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  1. 1.3 Measuring Angles Objectives • Measure angles with a protractor. • Identify and use the Angle Addition Postulate.

  2. acute angle complementary angles linear pair of angles obtuse angle right angle supplementary angles 1.3 Measuring Angles Glossary Terms

  3. 1.3 Measuring Angles Theorems, Postulates, & Definitions Angle Congruence Postulate 1.3.2: If two angles have the same measure, then they are congruent. If two angles are congruent, then they have the same measure. Angle Addition Postulate 1.3.3: If point S is in the interior of PQR, then m PQS + m SQR = m PQR.

  4. 1.3 Measuring Angles Theorems, Postulates, & Definitions Linear Pair Property 1.3.5: If two angles form a linear pair, then they are supplementary.

  5. 1.3 Measuring Angles Key Skills Determine the measure of a given angle. Find the measures of angle BVC. m BVC =125 – 50= 75

  6. 1.3 Measuring Angles Key Skills Add measures of angles. m AVC = m AVB + m BVC = 25 + 75 = 100

  7. TOC 1.3 Measuring Angles Key Skills Determine whether angles are congruent. AVB and BVC are not congruent because they do not have the same measure.

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