Question

Triangle DEF is 4 times smaller than triangle ABC. Find the length perimeter of triangles ABC and DEF.

http://curriculum.kcdistancelearning.com/courses/GEOMx-HS-WA10/b/assessments/S-SimilarityQuiz/Geometry_6.2.8_Quiz_FINAL_9q3.gif

Answer 1

Please help! I am clueless :(

Answer 2

to find out perimeter of DEF first you need to find area of ABC..

Answer 3

actually you dont need that, just use similarity
7.5/15=a/49