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a/b
a2/b2
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Practice p632 #1113, 17, 18, 2123, 35, 44, 45
p638 #1, 2
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1696
16 24 3636 54 48
2/33/4
2/33/4
4/99/16
12 1615 20
9 12
6
4
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5 in
7 in
Given: Regular Octagons
What is the scale factor?
What is the ratio of their perimeters?
What is the ratio of their areas?
Given: Similar Trapezoids
What is the scale factor?
What is the ratio of their perimeters?
What is the ratio of their areas?
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What is the scale factor of these regular pentagons?
What is the ratio of their areas?
perimeter = 7 cm
perimeter = 21 cm
What is the scale factor of these regular docecagons?
What is the ratio of their perimeters?
Area = 25 m2
Area = 144 m2
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Given: Similar Parallelograms
What is the ratio of the perimeters?
Area = 18 in2
Area = 98 in2
Area = 2π cm2
Area = 200π cm2
What is the ratio of the circumferences?
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Scale Factor
ab
Perimeter
a1 P1
b1 P2=
Area
a2 A1
b2 A2=
Volume
a3 V1
b3 V2=
5 in7 in
Find the area of the smaller octagon to the nearest tenth.
A = 236.6 in2
Scale Factor
ab
Perimeter
a1 P1
b1 P2=
Area
a2 A1
b2 A2=
Volume
a3 V1
b3 V2=
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Scale Factor
ab
Perimeter
a1 P1
b1 P2=
Area
a2 A1
b2 A2=
Volume
a3 V1
b3 V2=
The scale factor of two similar floors is 5 : 3. It costs $336 to tile the larger floor. At that rate, how much would it cost to tile the smaller floor?
Practice p638 #7, 1017, 1921, 36, 39
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