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Ron used 121 congruent equilateral triangles with 2 cm side lengths to form one large equilateral triangle. What is the perimeter of the large triangle?
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Ron used 121 congruent equilateral triangles with 2 cm side lengths to form one large equilateral triangle. What is the perimeter of the large triangle?

User Riggy
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please read the attached file
Ron used 121 congruent equilateral triangles with 2 cm side lengths to form one large-example-1
User Sindar
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