Do Now Do Now you will need your book you will need your book Draw a figure in your notebook. Draw a figure in your notebook. Label it with any side lengths you’d Label it with any side lengths you’d like. like. Then apply a scale factor of 3:2. Then apply a scale factor of 3:2. Should you scaled model be bigger or Should you scaled model be bigger or smaller? smaller? Draw the scaled model in your Draw the scaled model in your notebook. notebook. 3-25-09
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Do NowDo Nowyou will need your bookyou will need your book
Draw a figure in your notebook. Draw a figure in your notebook.
Label it with any side lengths you’d Label it with any side lengths you’d like.like.
Then apply a scale factor of 3:2.Then apply a scale factor of 3:2.Should you scaled model be bigger or Should you scaled model be bigger or
smaller?smaller?Draw the scaled model in your Draw the scaled model in your
notebook. notebook.
3-25-09
ObjectiveObjective
Today we will practice more with Today we will practice more with setting up proportions and solving setting up proportions and solving for missing sides. for missing sides.
3-25-09
3-25-09
1541
12
54.6620
x
oror
12
20 41
x=
41
12 20
x =
Page 279Page 2793-25-09
Page 280Page 280
ClosingClosing
What does it mean if two triangles What does it mean if two triangles are similar?are similar?
How can we be sure that two How can we be sure that two polygons are similar figures?polygons are similar figures?
3-25-09
H/WH/W
Page 286 #10 A-IPage 286 #10 A-I
Study for tomorrow’s quiz on Scale Study for tomorrow’s quiz on Scale Factors, and using scale factors and Factors, and using scale factors and proportions to solve for missing sides proportions to solve for missing sides of polygons. of polygons.