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3ft 6in - 2ft 7in = 11 inches.
1ft and 7in
The easiest method is to convert both to inches, subtract, then restate if needed: 1ft 7in = 19 in 2ft 2in = 26in So 26-19= 7 in
There is one equilateral triangle with 3 equal sides of 7in
As many as you like but they will all be equilateral triangles