Maths-
SAT
Easy
Question
Triangle ABC and triangle DEF are similar triangles, where 
are corresponding sides. If DE = 2AB and the perimeter of triangle ABC is 20, what is the perimeter of triangle DEF?
- 10
- 40
- 80
- 120
The correct answer is: 40
ABC 
DEF
DE = 2AB; EF = 2BC; DF = 2AC
DE + EF + EF = 2AB + 2BC + 2AC
= 2 (AB +BC + AC)
= 2(20) = 40
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