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Welcome to class

Welcome to class. The warm up is 1-2 Word puzzle on the table. Let’s grade your homework. 1.3 Measuring Angles. Please get: one piece of patty paper protractor your notes. With the straight edge, draw these angles on your patty paper (DO NOT FREE HAND):

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Welcome to class

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  1. Welcome to class The warm up is 1-2 Word puzzle on the table

  2. Let’s grade your homework

  3. 1.3 Measuring Angles Please get: one piece of patty paper protractor your notes

  4. With the straight edge, draw these angles on your patty paper (DO NOT FREE HAND): S R P Q Measure each angle. Do you notice anything?

  5. S P R Q Which one makes sense? B A Angle Addition Postulate m PQS + m  SQR = m  PQR  A +  B = 85° Or m A + m B = 85°

  6. Angle Congruence Postulate • If two angles have the same measure, then they are congruent. • the converse is also true: If two angles are congruent, then they have the same measure.

  7. Are you doing ok? • COMPLEMENTARY Angles – Exactly two angles whose sum is 90°. Each angle is a COMPLEMENT of the other. • SUPPLEMENTARY Angles = Exactly two angles whose measure is 180°. Each angle is a SUPPLEMENT of the other. 30° B 120° C A 60° Complementary angles are  A and  B  A and  B are complements of each other  A and  C are supplementary angles  A and  C are supplements of each other

  8. Linear Pair Property If two angles form a line, they are a linear pair AND are supplementary. 125° 55°

  9. Angles RIGHT ANGLE = 90° INDICATED BY THE BOX IN THE CORNER ACUTE ANGLE = angle less than 90° OBTUSE ANGLE = angle more than 90° but less than 180° STRAIGHT ANGLE = angle that equals 180° REFLEX ANGLE = angle greater than 180° and less than 360°.

  10. Whiteboards Please get a whiteboard, marker, and eraser. Doodle time starts in one minute.

  11. Your assignment 1.3 Wksht

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