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Ch 9.7. Learning Target: I will be able to identify and use proportional relationships of similar triangles. Standard 11.0 Students determine how changes in dimensions affect the perimeter of common geometric figures. Ch 9.7 Perimeters and Similarity. Ch 9.7. Concept. Ch 9.7. - PowerPoint PPT Presentation
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Ch 9.7Perimeters and Similarity
Standard 11.0Students determine how changes in dimensions
affect the perimeter of common geometric figures.
Learning Target:I will be able to identify and use proportional relationships of similar triangles.
Ch 9.7
Ch 9.7
Use a Scale Factor to Find Perimeter
If ABCDE ~ RSTUV, find the scale factor of ABCDE to RSTUV and the perimeter of each polygon.
Ch 9.7
Use a Scale Factor to Find Perimeter
The scale factor ABCDE to RSTUV is or . ___AEVU
__47
Write a proportion to find the length of DC.
Since DC AB and AE DE, the perimeter of ABCDE is 6 + 6 + 6 + 4 + 4 or 26.
Write a proportion.
4(10.5)= 7 ● DC Cross Products Property
6 = DC Divide each side by 7.
Ch 9.7
Use a Scale Factor to Find Perimeter
Use the perimeter of ABCDE and scale factor to write a proportion. Let x represent the perimeter of RSTUV.
Theorem 7.1
Substitution
4x = (26)(7) Cross Products Property
x = 45.5 Solve.
Ch 9.7
Answer: The perimeter of ABCDE is 26 and the perimeter of RSTUV is 45.5.
A. LMNOP = 40, VWXYZ = 30
B. LMNOP = 32, VWXYZ = 24
C. LMNOP = 45, VWXYZ = 40
D. LMNOP = 60, VWXYZ = 45
If LMNOP ~ VWXYZ, find the perimeter of each polygon.
Ch 9.7
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