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3 years ago

How can I solve this problem?

Mathematics

1 answer:

HACTEHA [7]3 years ago

7 0

Answer:

25*pi or

78.5 square units.

Step-by-step explanation:

If there was no shaded area, the area of the circle would be pi * r^2

r = 10

Area = pi * 10^2

Area = 100 * pi

Since there is a shaded area, the shaded part looks to be 1/4 of the whole. There's no indication of what it actually is, but 1/4 should be close enough.

Area_shade = 1/4 (100*pi)

Area_shade = 25 * pi

That's one answer.

Another is 25 * 3.14 = 78.5 square units

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What is the area of a sector with a central angle of 10π/7 radians and a radius of 18.4 m? use 3.14 for π and round your final a

AnnyKZ [126]

Answer:

$759.34\ m^2$

Step-by-step explanation:

step 1

Find the area of the circle

The area of the circle is equal to

$A=\pi r^{2}$

we have

$r=18.4\ m$

substitute

$A=\pi(18.4)^{2}$

$A=338.56\pi\ m^{2}$

step 2

we know that

The area of complete circle subtends a central angle of 2π radians

using proportion

Find out the area of a sector with a central angle of 10π/7 radians

$\frac{338.56\pi}{2\pi } =\frac{x}{(10\pi/7)}\\\\x=(10\pi/7)(338.56)/2\\\\x=241.829\pi\ m^2$

use

$\pi =3.14$

$241.829(3.14)=759.34\ m^2$

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3 years ago

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Vadim26 [7]

Answer:

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Step-by-step explanation:

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