An equilateral triangle of side 3 inch is given. How many equilateral triangles of side 1 inch can be formed from it

2 Answers on this Question

1. Yes it is 9. Check this figure.
   / 1 in this row
   // 3 in this row
   /// 5 in this row
   total 9 triangles.

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2. 3×3=9

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