by multiplying 15 and 12 twice then add up your answer and that's the perimeter
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The perimeter is not going to have sq units. If the perimeter of a square is 15 units then the area would be 14.0625units squared.
Perimeter: 15+20+25 = 60 units
Perimeter = 15+10+15+10 = 50 units of measurement.
Yes but not a square (or rectangle). A quadrilateral with an area of 16 sq units must have sides of at least 4 units and so a perimeter of at least 16 units. However, a circle of perimeter 15 units will enclose an area of 17.905 sq units (to 3 dp) so an ellipse of 15 units' perimeter will meet the requirements.
12+12+15+15=54