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IMAS 2012 — Middle Primary Grades 3–4 — Round 1 Question 20

IMAS · IMAS 2012 — Middle Primary Grades 3–4 — Round 1

Question 20

The three figures in the diagram below have equal perimeters. What is $a:b:c$?

Question illustration

Question illustration

Question illustration
  1. 1:1:1
  2. 2:4:5
  3. 4:6:5
  4. 16:20:25
  5. 20:25:24