edu 653 powerpoint presentation
TRANSCRIPT
1.4 Measuring Anglesby: Keri Adams
Focus Question: How do you measure an angle with an angle
ruler and a protractor?
Measuring AnglesVideo
Launch:
http://dashweb.pearsoncmg.com/main.html
Can you estimate these measurements?
Prior Knowledge Connection:
http://www.wyzant.com/help/math/geometry/lines_and_angles/introduction_to_angles
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
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
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:
What were some of your angle measurements?
Summary: Question B:
http://dashweb.pearsoncmg.com/main.html
What angles are acute, obtuse, or right?
Summary: Question C:
http://dashweb.pearsoncmg.com/main.html
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
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.:
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!!