7 4 Similar Triangles Day 1.notebook - math.mvhs.nbed.nb.camath.mvhs.nbed.nb.ca/K....
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7_4 Similar Triangles Day 1.notebook April 10, 2015
Warm UpApril 10, 2015
1) Find the length of the missing sides of the similar polygons
12.5x
11
26.25
7.14
y
Show work
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7_4 Similar Triangles Day 1.notebook April 10, 2015
Questions from the homework...
6.
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7_4 Similar Triangles Day 1.notebook April 10, 2015
Warm Up
1) Find the length of the missing sides of the similar polygons
12.5x
26.25
7.14
y11
12.5 = x = 1126.25 7.14 y
12.5 = x 26.25 7.14
12.5 = 1126.25 y
cross multiply
26.25 x = (12.5)(7.14)
26.25 x = 89.25
26.5 x = 89.2526.25 26.25
solve for x
x = 3.4
full ratio
12.5 y = (11)(26.25)
12.5 y = 288.75
12.5 y = 288.7512.5 12.5
solve for y
y = 23.1
Solution
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7_4 Similar Triangles Day 1.notebook April 10, 2015
Triangles
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7_4 Similar Triangles Day 1.notebook April 10, 2015
Are these triangles similar?
T
R
I
C
A
N3
4
5.2 9
12
15.6
Let's Compare sideserase
Triangles are just polygons
Step 1) Match up Angles
Step 2) Set up ratios
TRI CNA
TRCN
RINA
TICA
= =
412
5.2 15.6
39= =
0.3 = 0.3 = 0.3
Since corresponding sides are proportionate and angles are equal then
TRI CNA~
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7_4 Similar Triangles Day 1.notebook April 10, 2015
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7_4 Similar Triangles Day 1.notebook April 10, 2015
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7_4 Similar Triangles Day 1.notebook April 10, 2015
Angles equal and sides are proportionate
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7_4 Similar Triangles Day 1.notebook April 10, 2015
Create a proportion,by matching the
corresponding sides!!
Write the Similarity Statement:
Write the proper ratios:
Fill in the ratios:
Solve:
WHAT YOU HAVE TO INCLUDE ON A TEST
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7_4 Similar Triangles Day 1.notebook April 10, 2015
Solve for x .
a) AB
C
x
12.0
25.6
6.012.8
8.5
You only need a full ratio and a ratio with the missing side
2 ratios needed
=
Similarity statement
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7_4 Similar Triangles Day 1.notebook April 10, 2015
Show your work
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7_4 Similar Triangles Day 1.notebook April 10, 2015
5
6
9
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RU
T p12
1810
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7_4 Similar Triangles Day 1.notebook April 10, 2015
Homework
Page 349 350
4) Show all work5)6)7)
ab