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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 Rodrigo Reis
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The number of smaller triangles along one side of the larger triangle is the square root of the total number of triangles. The perimeter of the large triangle is ...
3*(2 cm)*√121 = 66 cm
User AlexAndro
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