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algol13
2 years ago
8

Help asap

Mathematics
1 answer:
Mama L [17]2 years ago
6 0

Answer:

216\pi

Step-by-step explanation:

Given the figure.

And the perimeter in the ratio 4: 2: 1.

Perimeter of smallest circle = 8\pi

To find:

Area of shaded region.

Solution:

To find the area, we need to have radius first.

And radius can be calculated by the given perimeter.

Formula for Perimeter is given as:

Perimeter = 2\pi r

8\pi = 2\pi r\\\Rightarrow r = 4\ cm

Radius of smallest circle = 4 cm

Ratio of perimeter is equal to the ratio of the radii.

Radius of 2nd smallest circle by the given ratio = 8 cm

Radius of largest circle = 16 cm

Area of a circle is given the formula:

A = \pi r^2

Area of the smallest circle = \pi 4^2 = 16\pi\ cm^2

Area of the 2nd smallest circle = \pi 8^2 = 64\pi\ cm^2

Area of the largest circle = \pi 16^2 = 256\pi\ cm^2

Area of the shaded region = Area of largest circle + 2 \times Area of 2nd smallest circle + 3 \times Area of smallest circle - 2 \times Area of smallest circle - 3 \times Area of 2nd smallest circle

Area of the shaded region = Area of largest circle - Area of 2nd smallest circle + Area of smallest circle = 256\pi - 64\pi +16\pi = 216\pi

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A researcher wishes to estimate the number of households with two cars. How large a sample is needed in order to be 99% confiden
solmaris [256]

Answer:

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Step-by-step explanation:

given data

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margin of error = 3%

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solution

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