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

Question

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

nachobioteck · Answer

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

Bunuel · Answer

PareshGmat · Answer

peri.png Perimeter = \frac{2\pi 8}{2} + 8 + 8 = 8\pi + 16 = 25.12 + 16 = 41.12 Answer = D

MathRevolution · Answer

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

CrackverbalGMAT · Answer

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)

Devmitra Sen
GMAT SME

ScottTargetTestPrep · Answer

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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