revise similarity

If two triangles are similar, it means...

• their angles are equal and their sides must be equal

• their angles are equal and the ratios of their corresponding sides are equal

 $\Delta PQR\ is\ similar\ to\ \Delta CIA\ then\ \angle PRQ=.....$  

•  $\angle CAI$ 

•  $\angle CIA$  

•  $\angle AIC$  

•  $\angle IAC$  

 $\Delta PQR\ is\ similar\ to\ \Delta CIA.\ Which\ of\ the\ following\ is\ true?$ 

•  $\frac{PQ}{CI}=\frac{QR}{IA}=\frac{PR}{CA}$ 

•  $\frac{PQ}{QR}=\frac{CI}{IA}=\frac{PR}{CI}$  

 $\Delta ABC\ is\ similar\ to\ \Delta PQR.\ fill\ in\ the\ blanks\ to\ complete\ the\ ratios.$   $\frac{AB}{....}=\frac{....}{QR}$  

•  $\frac{AB}{PQ}=\frac{BC}{QR}$  

•  $\frac{AB}{CB}=\frac{PQ}{QR}$  

Are these triangles similar?

• yes

• no

Are these triangles similar?

• yes

• no

Complete the similarity statement.

 $\Delta ABC\ is\ similar\ to\ .....$  

•  $\Delta PQS$  

•  $\Delta SPQ$  

•  $\Delta QPS$  

• they are not similar

Complete the similarity statement.

 $\Delta ABC\ is\ similar\ to\ ......$  

•  $\Delta KTJ$  

•  $\Delta JKT$  

•  $\Delta TJK$  

• they are not similar

Which is the corresponding angle to ∠a?

•  $\angle e$  

•  $\angle f$  

•  $\angle g$  

•  $\angle h$  

what is the term used for  $\angle d\ and\ \angle e$  ?

• vertical angles

• alternate interior angles

• corresponding angles

• supplementary angles