http://www.ck12.org Chapter 7. Similarity
1. 4 SAM∼4
2. SA? =SM? =RI?
3.SM=
4.T R=
5.^9 ?=? 8
Answer questions 6-9 about trapezoidABCD.
- Name two similar triangles. How do you know they are similar?
- Write a true proportion.
- Name two other triangles that mightnotbe similar.
- IfAB= 10 ,AE= 7 ,andDC=22, findAC. Be careful!
10.WritingHow many angles need to be congruent to show that two triangles are similar? Why?
11.WritingHow do congruent triangles and similar triangles differ? How are they the same?
Use the triangles below for questions 12-15.
AB= 20 ,DE= 15 ,andBC=k.