7.5 proportions in triangles.notebook
January 13, 2017
1/12/17 - Warm Up Problem
Determine whether the two triangles are similar. If they are, state what method can be used to prove it: AA, SSS, or SAS.
16
3
1
4
12
4
7.5 proportions in triangles.notebook
January 13, 2017
QUIZ REVIEW - Concept 16
Find the value of x and y.
18
5
y
12
8
x
7.5 proportions in triangles.notebook
January 13, 2017
Section 7.5 - Proportions in Triangles
Goals: Use theorems about proportionality to find missing
measures on triangles
Is the small triangle in the picture
similar to the large triangle it is
8
inside?
4
Theorem 7-4 - Side-Splitter Theorem
If a line is parallel to one side of a triangle and
intersects the other two sides, then it divides
those sides proportionally.
6
3
7.5 proportions in triangles.notebook
• Write a proportion using the pieces of each side
• Solve the proportion by cross-multiplying
Find the value of x.
January 13, 2017
7.5 proportions in triangles.notebook
Do this one in your notes...
January 13, 2017
7.5 proportions in triangles.notebook
January 13, 2017
Corollary to the Side-Splitter Theorem
If three parallel lines intersect two
transversals, then the
segments intercepted on the transversals proportional.
are
A
6
x
B
5
C
4
F
D
E
3
G
Do this one in your notes.
7.5 proportions in triangles.notebook
January 13, 2017
Find the value of x.
12
3
x 10
7.5 proportions in triangles.notebook
Assignment:
pg. 475
(9-18)
January 13, 2017