Angle Classification
To view as a MS Word document, link here.
Objectives
· TSWBAT classify angles as acute, obtuse, and right.
·
TSWBAT
recognize, explain, and use complementary and supplementary angles.
Key points
Link to GSP file of Angle Classifications
·
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)
Warm-up (5-10 minutes)
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.
Presentations (20-25 minutes)
On SMART Board with projector
Teacher/students may comment with SMART notes after presentations
Stations (5-10 minutes each)
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.
When not at a station
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
Wrap-up (<5 minutes)
Homework (if necessary)
Finish p. 31: 27 – 34 and journal entry: Find a “clever” way to remember complementary angles vs. supplementary angles.
Return to Carol Love's Lesson Plan