Here are area and perimeter formulas for common geometric shapes
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Area of Triangle | 1/2bh or (bh)/2
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| Area of Parallelogram | bh
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| Perimeter of Triangle | add up the sides
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| Perimeter of Parallelogram | (b+s)*2 (where b is the base, and s is the side that is not the height)
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| Perimeter of Rectangle | (l+w)*2
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| Area of Rectangle | lw
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| Area of Circle | r*r*pi
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| Circumference of Circle | d*pi
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| Dimensions farthest apart | greatest perimeter, least area
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| Dimensions closest together | least perimeter, greatest area
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| How do we find all possible rectangles with a fixed area? | Think of all factor pairs of the area
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| 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
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| Area or semi-circle | Find the area as if it was a full circle and divide by 2
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| Circumference of semi-circle | Find the circumference as if it is was a full circle and divide by 2
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Created by:
emains
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