Answer:
SSS
Step-by-step explanation:
the ratio between the length of AB to DE is 3/18 = 1/6
The ratio between the length of AC to DF is 6/36 = 1/6
The ratio between the length of BC to EF is 7/42 = 1/6
Since AB/DE=AC/DF=BC/EF=1/6
Then triangle ABC is similar to triangle DEF (SSS)
