1. 6.5 SSS & SAS Similarity Theorems November 18, 2011
Bellwork
Determine if 2 triangles are similar. If they are, write a similarity
statement.
2.
Yes; ABE ~ ACD no
Find the length of BC
4. A tree casts a shadow that is 30 feet
long. At the same time a person standing
nearby,who is five feet two inches tall,
casts a shadow that is 50 inches long. How
tall is the tree to the nearest foot?
37 ft
7.5
HW pg. 4­22 evens & 37 1

2. 6.5 SSS & SAS Similarity Theorems November 18, 2011
6.5 Prove Triangles Similar by SSS & SAS
SSS Similarity Theorem: If the corr. sides of 2 s are proportional, then the s are ~.
A R
If AB = BC = CA, then ABC ~ RST
RS ST TR
S T
C
B
HW pg. 4­22 evens & 37 2

3. 6.5 SSS & SAS Similarity Theorems November 18, 2011
HW pg. 4­22 evens & 37 3

4. 6.5 SSS & SAS Similarity Theorems November 18, 2011
SAS Similarity Theorem: If an < is ≅ to another < in 2nd and the included sides
are proportional, then the are ~. M
X
If <X≅<M & ZX = XY, then XYZ ~ MNP
PM MN
P N
Z Y
HW pg. 4­22 evens & 37 4

5. 6.5 SSS & SAS Similarity Theorems November 18, 2011
HW pg. 4­22 evens & 37 5

6. 6.5 SSS & SAS Similarity Theorems November 18, 2011
p g.
HW391
#4-22 evens & 37
HW pg. 4­22 evens & 37 6