It is impossible to answer the question. 5 m , 2 m and 12 m cannot represent a triangle. There is no additional information to say what the shape is!
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A figure that has an area of 5 units [base x height] has the obvious dimensions 1 and 5 since 5 is a prime number. If the figure is a rectangle then the dimensions can be : length= 5 height= 1. Area= 5 x1= 5cm^2 Perimeter= 5+5+1+1=12cm
A 5-sided figure can be drawn with any area that anybody wants.
Triangles do not have a "length", so I am going to assume you mean the height is 5. The area would then be 30. 1/2 base x height = Area 1/2 (12) x 5 = 30
A rectangle with length 5 and width 1 would satisfy those conditions. The area is 5*1=5. The perimeter is 5+1+5+1=5+5+1+1=2(5)+2(1)=10+2=12.
perimeter = (5+5+12+12)= 34 area = (5*12) = 60 squared