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A semicircle has a radius of 8. What is the approximate perimeter of

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A semicircle has a radius of 8. What is the approximate perimeter of [#permalink] New post   02 Oct 2014, 12:51
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A semicircle has a radius of 8. What is the approximate perimeter of the semicircle?

A. 25
B. 16
C. 33
D. 41
E. 58
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D
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Re: A semicircle has a radius of 8. What is the approximate perimeter of [#permalink] New post   02 Oct 2014, 14:17
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perimeter of a circunference =2pi*r

perimeter of a semicircle = pi*r + 2r

aprox perimiter = 3.14*8 + 2*8 = 41.12 aproximately 41

answer D
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Re: A semicircle has a radius of 8. What is the approximate perimeter of [#permalink] New post   02 Oct 2014, 15:19
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Turkish wrote:
A semicircle has a radius of 8. What is the approximate perimeter of the semicircle?

A. 25
B. 16
C. 33
D. 41
E. 58


Similar question to practice: arc-abc-is-a-semicircle-the-perimeter-of-region-abc-is-x-160723.html
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A semicircle has a radius of 8. What is the approximate perimeter of [#permalink] New post   09 Oct 2014, 20:21
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Attachment:
peri.png
peri.png [ 1.4 KiB | Viewed 4220 times ]


Perimeter \(= \frac{2\pi 8}{2} + 8 + 8 = 8\pi + 16 = 25.12 + 16 = 41.12\)

Answer = D
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Re: A semicircle has a radius of 8. What is the approximate perimeter of [#permalink] New post   16 May 2021, 00:24
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Perimeter of semicircle = Circumference of circle divided by 2 + diameter = \(\frac{2πr}{2} + d = πr + d\)

Given: r = 8 so d= 2r = 2 * 8= 16 ; π = 3.14 ;

Perimeter of semicircle = 3.14 * 8 + 16 = 25 + 16 = 41

Answer D
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Re: A semicircle has a radius of 8. What is the approximate perimeter of [#permalink] New post   16 May 2021, 01:54
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Solution:

Perimeter = (pi)*r + 2r

= (pi)*8 + 2*8

=(pi)*8 + 16

=8*3.14 + 16

=>If you take 3.14 as 3 you would have 40 as answer and hence nearest option is (d).

(option d)

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Re: A semicircle has a radius of 8. What is the approximate perimeter of [#permalink] New post   26 Oct 2022, 10:12
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Turkish wrote:
A semicircle has a radius of 8. What is the approximate perimeter of the semicircle?

A. 25
B. 16
C. 33
D. 41
E. 58


Since the radius is 8, the diameter is 16, and the circumference is 16π. Half of the circumference is then 8π or approximately 8 x 3.14 ≈ 25.

Thus, the approximate perimeter of the semicircle is 16 + 25 = 41.
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Re: A semicircle has a radius of 8. What is the approximate perimeter of [#permalink]
26 Oct 2022, 10:12
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