6-3 similar triangles 6-4 parallel lines & similarity
Post on 12-Nov-2014
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6-3 Similar Triangles
• Similar Triangles have the same angle measures.
• To check if two triangles are similar:
…match up the corresponding sides and check the proportion using cross-products.
36
12
30 2
65
Are these trianglessimilar?
122
305
=
Make sure you
check all sides!
REAL LIFE !
?
285 ft.
6 ft
2.3 ft
?6
=2852.3
How tall is this
building?
The shadowis 285 ft.
long !
Rules o’ Triangle Similarity
1> If ya know TWO angles be
congruent, then the triangles be similar!
called “A.A.” similiarity
2> If ya know the three sides be proportional, then the triangles be similar !
2
1
5
4
2
10
SSS Similarity
3> If two sides be congruent, and the angles between them be congruent, thenthe whole triangle be similar !
6
18
4
12
SAS Similarity
6-4 Parallel Lines and Proportional Parts
A
B C
D E
A
B C
D E
MIDSEGMENT
DE = ½ BC
AB
C
DEF
A
BC
DEF
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