Similar Triangles Proportional Sides

Find side length X.

• 30

• 25

• 15

• 40

If two figures are similar, the corresponding sides are ______________.

• equal

• congruent

• proportional

• none of these

Are the triangles similar?

• Yes

• No

Given that Triangle ABC is similar to Triangle DEF. Find the angle B.

• 60⁰

• 42⁰

• 79⁰

• 180⁰

If three sides of one triangle are proportional to the 3 corresponding sides of another triangle, then the triangles are similar.

• This is AAS

• This is SSS

• This is SAS

Look for the pattern! The sides should match up in the proportion.

• a

• b

• c

• d

• a

• b

• c

• d

Complete each proportion.
AB / AM  =  ? / AD

• BC

• AC

• MD

• MC

• a

• b

• c

• d

Given that Triangle BAC is similar to Triangle EDF. Find the angle EFD.

• 45

• 22

• 113

• 18