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Kitty [74]
2 years ago
6

Find the diameter of a circle if its area isa. 100cm2Ibucm2c. 400mcm2d. - ncm24​

Mathematics
1 answer:
Mars2501 [29]2 years ago
5 0

Answer:

Diameter = 11.28cm  --- (a)

Diameter =22.58 cm  --- (c)

Step-by-step explanation:

Only (a) & (c) are clear enough to be solved. Others are not properly presented.

Use the following explanations of (a) & (c) to answer others.

a.\ Area = 100cm^2

Area is calculated as:

Area = \pi r^2

Substitute 100 for Area

100 = \pi r^2

Take π as 3.14. So, the expression become

100 = 3.14 r^2

Divide both sides by 3.14

\frac{100}{3.14} = \frac{3.14 r^2}{3.14}

\frac{100}{3.14} = r^2

r^2 = \frac{100}{3.14}

r^2 = 31.847133758

Solve for r

r = \sqrt{31.847133758

r = 5.64

But diameter = 2 * radius

So:

Diameter = 2 * 5.64

Diameter = 11.28

a.\ Area = 400cm^2

Area is calculated as:

Area = \pi r^2

Substitute 400 for Area

400 = \pi r^2

400 = 3.14 r^2

Divide both sides by 3.14

\frac{400}{3.14} = \frac{3.14 r^2}{3.14}

\frac{400}{3.14} = r^2

r^2 = \frac{100}{3.14}

r^2 = 127.388535032

Solve for r

r = \sqrt{127.388535032

r = 11.29

But diameter = 2 * radius

So:

Diameter = 2 * 11.29

Diameter =22,58

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3 years ago
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pychu [463]
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