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A&P Formulas
Here are area and perimeter formulas for common geometric shapes
Question | Answer |
---|---|
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 |