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lana [24]
3 years ago
7

A building engineer analyzes a concrete column with a circular cross section. The circumference of the column is 18π meters. Wha

t is the area of the cross section?
Mathematics
1 answer:
Whitepunk [10]3 years ago
7 0
Answer: 81pi square meters

--------------------------------------------------------

Work Shown

C = 18pi is the given circumference
d = diameter which is unknown

C = pi*d
18pi = pi*d
18 = d
d = 18

The diameter is 18 meters.
Half of this is the radius r = d/2 = 18/2 = 9
The radius is 9 meters

Use the value of r to find the area of the circle
A = pi*r^2
A = pi*9^2
A = pi*81
A = 81pi

The area of the circular cross section is 81pi square meters

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1               ^4C_1 (1/2)^{4}       = 1/4                       \frac{5}{16}

2                ^4C_2 (1/2)^{4}      = 3/8                      \frac{11}{16}

3                ^4C_3 (1/2)^{4}      = 1/4                       \frac{15}{16}

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4 0
3 years ago
A child’s wading pool has a diameter of 5 feet and a height of 2 feet. How much water would it take to fill the pool?
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Step-by-step explanation:

The formula for finding the volume is V=πr^2*d (where h is the height and r is  the radius).

Plug in the values: V=π(2.5)^2*2 (Diameter=2*Radius)

Solve: V=6.25π*2

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Answer:

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Correct choice is B

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2 years ago
What is the domain of g
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A

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