It is an equilateral triangle
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16 cm
There is only one possibility in forming a triangle from the given dimensions and it is 4cm by 14cm by 16cm
If it is an equilateral triangle with 3 equal sides of 4m then its perimeter is 12cm
For it to be a right angle triangle the 3rd side must be 5cm
You cannot, because you have no information on the shape: is it a 2-d triangle or a 3-d cuboid?