3 x 5 cm = area 15 square cm
BUT a shape 3 x 5 is not a square, it is a rectangle.
A square would either be 3 x 3 or 5 x 5 size.
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Area = 0.5*(3.5+5.5)*12 = 54 square cm
The area of square is : 16.0
Area of square with 12.5 cm sides is 12.5 times 12.5 = 156.25 square cm
If the sum of its parallel sides is 6.5 cm Then its height is 52/6.5 = 8 cm Check: 0.5*6.5*8 = 26 square cm
You can imagine it to be the area of a square figure (four equal sides and angle beween adjacent sides is 90 degrees) whose side is7 cm