Answer:
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Step-by-step explanation:
A composite figure is made up of several simple geometric figures such as triangles, rectangles, squares, circles, and semicircles. To find the area of a composite figure, separate the figure into simpler shapes whose area can be found. Then add the areas together.
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3/5 or 60%.
2/3 hour is 40 minutes, so 1/3 is 20 minutes.
40 minutes have passed and 2/5 of the progress on the floor is complete. In 20 minutes, 1/5 of the work is complete. Add 20 minutes to 40 minutes to get 60 minutes, or an hour.
Because of this, we need to add the progress of 20 minutes and 40 minutes. 1/5+2/5=3/5.
28.26 feet squared
Work:
A = π r²
A = 3.14 (3²)
A = 3.14 (9)
A = 28.26
The volume for a pyramid is
![V= \frac{1}{3} Bh](https://tex.z-dn.net/?f=V%3D%20%5Cfrac%7B1%7D%7B3%7D%20Bh)
, where B is the area of the base and h is the height. We are given the volume, and the base and height in terms of x. Our formula then looks like this:
![768= \frac{1}{3} (x)( \frac{1}{6} x)](https://tex.z-dn.net/?f=768%3D%20%5Cfrac%7B1%7D%7B3%7D%20%28x%29%28%20%5Cfrac%7B1%7D%7B6%7D%20x%29)
. Simplifying the right side we have
![768= \frac{1}{18} x^{2}](https://tex.z-dn.net/?f=768%3D%20%5Cfrac%7B1%7D%7B18%7D%20%20x%5E%7B2%7D%20)
. Multiply both sides by 18 to get rid of the fraction and we have
![13824= x^{2}](https://tex.z-dn.net/?f=13824%3D%20x%5E%7B2%7D%20)
, so x = 117.575