Angle Classification

To view as a MS Word document, link *here*.

Objectives

Key
Points

Warm-up

Stations

Wrap-up

Homework

#

·
*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)

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.

**Return to Carol Love's Lesson Plan**

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Carol Love's EMAT 6690 Page**

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