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maxonik [38]
2 years ago
8

The diameter of a circle is 20 feet. Using the formula A = r2, what is the area of the circle? Use 3.14 for pi.

Mathematics
1 answer:
sergey [27]2 years ago
3 0
Area = PI * radius ^ 2
radius = 10 feet
Area = PI * 100
Area = 3.14 * 100
Area = 314 square feet

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oksano4ka [1.4K]
Joel = j, Mark = m, Sandra = s
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m = 3j
j = 1/2 s --> s = 2j
plug in (substitute) each letter to make it in terms of only j: j + m + s = 120
j + 3j + 2j = 120
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now plug in for the j & s equation:
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Therefore Sandra has 40 coins!
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tatiyna

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