Find the perimeter of the following figure?
How would I go about finding the perimeter of the following figure.. I know the formula is pi r squared but I'm so stuck.
I tried to recreate it the best I could.
- melislynLv 51 decade agoFavorite Answer
so the missing piece is 1/2 a circle? in which case:
find perimeter of the rectangle:
6m*2 + 8m*2 = 12 + 16 = 28 m
find circumference of a circle with a diameter of 6m
-->the formula for circumference is 2*pi*radius OR pi*diameter (- the formula you have in your question is for the area of a circle)
-->since we know the diameter is 6, use pi*diameter:
6*3.1415 (or whatever equivalent you were told to use for pi)
-->divide by 2:
18.849/2 = 9.4245 m
so the perimeter of the figure is the perimeter of the rectangle minus 9.4245 m: (rounded 9.4245 to nearest hundredth: 9.42)
28 - 9.42 = 18.58 m
If you need the area of the figure, find the area of the rectangle and then subtract the area of the half-circle. (area of circle divided by 2).
Since the diameter was 6, the radius would be 3. (d/2 = r)
area of rectangle: 6*8 = 48 m^2
area of circle = pi*r*r = 3.1415*3*3 = 28.2735 divided by 2: 14.14
area of figure = 48 - 14.14 = 33.86 m^2
- 1 decade ago
Is that a semi-circle (half-circle) a the top?