My Homework Commitment

1
My Homework Commitment

• I promise, to never, ever, give up on a problem
  without first trying at least two ideas on my
  paper

2
Proportions Notes

• A proportion is 2 ratios separated by an equals
  sign
• Like ?
• We can prove that the equation is true by using
  what we know about equivalent fractions.

3
Proportions Practice
4
Proportions Practice
5
SIMILAR FIGURES Corresponding sides of similar
figures are proportional.
4"
2"
3"
6"
6
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7
6
4
8
6
4
9
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These 3 triangles are all similar. Find h.
h
4
x
x
1.5
3
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Similar Figures (applications)
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SIMILAR TRIANGLES 1 Find the scale factor and
the length of the missing side. ABC DEF
A
C
40
50
F
D
B
60
y
E
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SIMILAR TRIANGLES 2 Find the scale factor and
the length of the missing side. ABC ADE
A
E
z
120
D
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SIMILAR TRIANGLES 3 Find the scale factor and
the length of the missing side. GHI GJK
K
36
32
J
G
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SIMILAR TRIANGLES 4 Find the length of the
missing side. PQR TSR
P
R
S
Q
T
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SIMILAR TRIANGLES 5 Find the height of the tree.
1.5 m
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SIMILAR TRIANGLES 6 Find the height of the
building.
1.5 m
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7 Bob wanted to know the distance across this
lake but he had no way to measure it.
A
B
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Doofus suggested measuring AC, CE, and DE.
A
B
C
E
D
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Bob did as he was told and found AC 0.55 mi.
CE 0.25 mi. DE 0.8 mi.
A
B
C
E
D
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FIND THE DISTANCE ACROSS THE LAKE. AC 0.55 mi.
CE 0.25 mi. DE 0.8 mi.
A
B
C
E
D
22
Find two more pairs of INTEGER lengths for AD
AE that result in ?ADE ?ABC