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1.4 Measuring Angles by: Keri Adams Focus Question: How do you measure an angle with an angle ruler and a protractor?

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1.4 Measuring Anglesby: Keri Adams

Focus Question: How do you measure an angle with an

angle ruler and a protractor?

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Investigation 1.4 Materials

• Angle rulers• Protractors• Labsheet 1.4 (Question E Angles)

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Investigation 1.4 Vocabulary

• Complimentary angles• Supplementary angles

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Can you estimate these measurements?

Prior Knowledge Connection:

http://www.wyzant.com/help/math/geometry/lines_and_angles/introduction_to_angles

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Which of these shapes has the smallest angle measure?

Which has the angle with the largest measure?

Can you find a 90⁰ angle in one of these shapes? How do you know it is 90⁰?

How do the angles in Shape D compare to a right angle? Are their measures greater than or less than a right angle?

What would be a reasonable estimate of the measure of the greatest angle of Shape D? How do you know?

Presenting the Challenge:

http://dashweb.pearsoncmg.com/main.html

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http://etc.usf.edu/clipart/42000/42068/protractorf_42068.htm

Introduction:

What is a protractor and how do you use it?

What is an angle ruler and how do you use it?

http://www.schoolmart.com/angleruler.aspx

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Your turn…

Work with your groups to complete Questions A-C.

Make sure you sketch each shape and label the angle measures on each shape.

Explore:

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What strategies did your group use to estimate the measures of

the angles?

Summary: Question A:

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What were some of your angle measurements?

Summary: Question B:

http://dashweb.pearsoncmg.com/main.html

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What angles are acute, obtuse, or right?

Summary: Question C:

http://dashweb.pearsoncmg.com/main.html

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Complementary Angles: Pair of angles whose measure add to 90⁰

Supplementary Angles: Pair of angles whose measure add to 180⁰

Pairs of complementary angles:

Pairs of supplementary angles:

Summary: Question D:

http://dashweb.pearsoncmg.com/main.html

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Summary: Question E:

http://dashweb.pearsoncmg.com/main.html

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How do you decide the number of degrees for angles between the 5⁰ intervals on the angle ruler?

What things do you check to make sure you are making accurate measurements?

Which tool do you prefer for measuring angles? Why?

Summary: Question E Cont.:

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Homework: Page 29 #19-28 (for #22-24 explain how you got your answer),

#31a & b#32a & d

**You will need a protractor for your homework!!

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Lesson from,Lappan, Phillips, Fey, Friel. (2014)

Connected Mathematics 3 Shapes and Designs. Boston: Pearson. Print.