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· TSWBAT classify angles as acute, obtuse, and right.
· TSWBAT recognize, explain, and use complementary and supplementary angles.
· Acute angles are less than 90º
· Obtuse angles are greater than 90º
· Right angles are exactly 90º
· Complementary angles are two adjacent angles that together form a right (90º) angle
· Supplementary angles are two adjacent angles that together form a straight line (180º angle)
Meet with your group from yesterday and be prepared to present when the buzzer sounds. Your group will have 5 minutes to present all four products.
On SMART Board with projector
Teacher/students may comment with SMART notes after presentations
1. Demonstrate acute, obtuse, and right angles on SMART Board, allowing students to test angles interactively. Show how angles with constraints are constructed. Teacher-led roundtable discussion
2. Update online journal with last night’s homework journal entry: Where do you see parallel and perpendicular lines in the “real world”? How would you explain to a new student the differences between lines, segments, and rays?
3. Complementary and Supplementary Angle Puzzles
Using the angles provided, find complementary and supplementary angle pairs.
1. Check last night’s homework
2. Work on p. 31: 27 – 34
3. Write new journal entry: Find a “clever” way to remember complementary angles vs. supplementary angles.
Example: complementary = completely 90, supplementary = straight
Finish p. 31: 27 – 34 and journal entry: Find a “clever” way to remember complementary angles vs. supplementary angles.