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# A&P Formulas

### Here are area and perimeter formulas for common geometric shapes

Area of Triangle 1/2bh or (bh)/2
Area of Parallelogram bh
Perimeter of Triangle add up the sides
Perimeter of Parallelogram (b+s)*2 (where b is the base, and s is the side that is not the height)
Perimeter of Rectangle (l+w)*2
Area of Rectangle lw
Area of Circle r*r*pi
Circumference of Circle d*pi
Dimensions farthest apart greatest perimeter, least area
Dimensions closest together least perimeter, greatest area
How do we find all possible rectangles with a fixed area? Think of all factor pairs of the area
How do we find all possible rectangles with a fixed perimeter? Divide the perimeter by 2 and think of all addend pairs that add up to half the perimeter
Area or semi-circle Find the area as if it was a full circle and divide by 2
Circumference of semi-circle Find the circumference as if it is was a full circle and divide by 2
Created by: emains