assuming you mean 20ft by 30ft, you just find the area. To find the area, simply multiply both sides, so 20x30 = 600 sq ft
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There are: 20 feet times 30 feet = 600 square feet
600 square feet (20x30=600)
27 square feet
Assuming that the 4 and 3 in your problem are feet, 12 square feet.
Perimeter of which geometry (square, circle, rectangle, triangle, ...)