Angle Classification

To view as a MS Word document, link here.

Objectives

Key Points

Warm-up

Stations

Wrap-up

Homework

# 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.

(see linked angle puzzles)

## 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)

Reminder: Quiz tomorrow over linear objects; parallel, perpendicular, and skew lines; and angle classification

# Homework (if necessary)

Finish p. 31: 27 – 34 and journal entry: Find a “clever” way to remember complementary angles vs. supplementary angles.

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