If you mean a 3 inches by 4 inches rectangle then its perimeter is 14 inches
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3+3+7+7 = 20 inches
Multiply the height by 3 to get the base.
Area = (base) x (height)= (5y - 3) x (11)= 55y - 33
it depends on what shape it is. square: perimenter/4 is one side's length. triangle: perminter/3 rectangle: perimeter/height = length or perimeter/length = height
To find the perimeter of a polygon, just add the length of all the sides. In this case, the four sides of the rectangle.