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The circle with center O below has radius 4. Find the follow

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The circle with center O below has radius 4. Find the follow [#permalink] New post 26 May 2019, 03:27
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The circle with center O below has radius 4. Find the following.

(a) Circumference of the circle

(b) Length of arc ABC

(c) Area of the shaded region

Attachment:
#GREexcercise The circle with center O below has radius 4.jpg
#GREexcercise The circle with center O below has radius 4.jpg [ 13.79 KiB | Viewed 189 times ]



[Reveal] Spoiler: OA
(a) \(8\pi\) (b) \(\frac{8\pi}{9}\) (c) \(\frac{16\pi}{9}\)


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Re: The circle with center O below has radius 4. Find the follow [#permalink] New post 26 May 2019, 04:20
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circumference = 8pi
length of the arc = 8pi/9
area of the arc = 16pi/9
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Re: The circle with center O below has radius 4. Find the follow [#permalink] New post 26 May 2019, 07:49
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Carcass wrote:
The circle with center O below has radius 4. Find the following.

(a) Circumference of the circle

(b) Length of arc ABC

(c) Area of the shaded region

Attachment:
#GREexcercise The circle with center O below has radius 4.jpg



Image

(a) Circumference of the circle
circumference = 2πr = 2π(4) =



(b) Length of arc ABC
Arc length = (central angle)/360° x circumference
= 40°/360° x 8π
= 1/9 x 8π
= 8π/9



(c) Area of the shaded region
Sector area = (central angle)/360° x area of circle
= (central angle)/360° x πr²
= 40°/360° x π4²
= 1/9 x 16π
= 16π/9

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Brent
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Re: The circle with center O below has radius 4. Find the follow   [#permalink] 26 May 2019, 07:49
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