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Day 1 Similar Figures.notebook
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April 08, 2013
Do Now
AIM: Indirect Measurement
If a dozen hens lay a dozen eggs in a dozen days, how long will it take 1000 hens to lay 1000 eggs at the same rate?
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Anticipatory SetIf 6 cats can catch and kill 6 rats in 6 minutes, how many cats will it take to catch and kill 100 rats in 50 minutes? Try solving this problem in more than one way.
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Corresponding Sides: Sides that are in the same position on two different figures.
Corresponding Angles: Angles that are in the same position on two different figures.
Similar Figures:
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Identify the corresponding sides in the pair of triangles. Then determine whether the triangles are similar.
A
B C
D
E F7 in
2 in 6 in 6 in12 in
14 in
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Find the length of DE
1.)
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2.)
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8 in2 in
12 in
?
3.)
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D
FE
A
B C
21 cm 27 cm
36 cm
35 cm 45 cm
x
4.)
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4.8 in
2.4 in
x
7 in
6 in
12 in
5.)
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4 in
1.5 in
4.5 inx
6.)
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How can we find the height of the flagpole in front of the school without taking it down? Determine a method for finding the answer.
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D.) Using Indirect MeasurementCity officials want to know the height of a traffic light. The traffic light casts a shadow that is 45 ft long. A stop sign casts a shadow that is 30 ft long. If the stop sign is 15 ft high, what is the height of the traffic light?
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1 A.) Write and solve a proportion to find the height of the shorter person.
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2 B.) Write and solve a proportion for this problem.
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3 C.) Write and solve a proportion to find the height of the flagpole.
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4 D.) Write and solve a proportion for this problem.
40 m
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5 E.) Write and solve a proportion to find the length of the shadow of the streetlight.
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Homework: Finish Class Notes
Mr. Tjersland's Math 7
