No, because you need some length for the third side - two lengths will only give an angle between them.
If the third side is greater than 3 ft and less than 13 ft then you can make a triangle with it, 8 ft and 5 ft.
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It is square ft.
18 ft
Yes, the three given lengths will form a triangle. Three lengths can make a triangle if, and only if, the sum of the two shorter lengths is greater than the longest length. The two shorter lengths are 56 ft and 16 ft with a sum of 56 ft + 16 ft = 72 ft 72 ft is greater than 65 ft so 56 ft, 65 ft and 16 ft will make a triangle.
No
yes