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In the figure above, what is the circumference of the circle with cent
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18 Dec 2017, 20:47
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Re: In the figure above, what is the circumference of the circle with cent
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18 Dec 2017, 21:54
Bunuel wrote: In the figure above, what is the circumference of the circle with center C? (A) 2π (B) 4π (C) 5π (D) 8π (E) 10π Attachment: 20171219_0837_003.png The circumference of the circle with center C = 2π r (radius) But what is r? It is distance between (5, 4) and (5,8)=4 Hence circumference of the circle with center C = 2*4*π = 8π Hence D
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Re: In the figure above, what is the circumference of the circle with cent
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19 Dec 2017, 06:26
Bunuel wrote: In the figure above, what is the circumference of the circle with center C? (A) 2π (B) 4π (C) 5π (D) 8π (E) 10π Attachment: 20171219_0837_003.png Distance between two points: \(\sqrt{(x2x1)^2+(y2y1)^2} = \sqrt{(55)^2+(84)^2}=√16=4\) Diameter: \(radius*2=(4)*2=8\) Circumference: \(diameter*π=(8)π\) (D) is the answer.



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Re: In the figure above, what is the circumference of the circle with cent
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10 Jan 2018, 05:54
We don't need to find a distance between two points since both points is on x=5 and "moves" along y coordinate. Just finding the difference between y coordinates is enough to find the radius. 84=4 so r equals 4,thus circumference is 2{\pi}*r=2*pi*4=8*pi Answer (D)
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Re: In the figure above, what is the circumference of the circle with cent
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10 Jan 2018, 16:15
Since there is a straight line through the circle because the two coordinates are (5, 8) and (5, 4), calculate the distance between the two y coordinates: 8  4 = 4. Hence 4 is the radius.
The equation for circumference of a circle is 2*pi*radius. Thus 2*pi*4 = 8*pi (Option D).



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Re: In the figure above, what is the circumference of the circle with cent
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16 Jan 2018, 16:36
Bunuel wrote: In the figure above, what is the circumference of the circle with center C? (A) 2π (B) 4π (C) 5π (D) 8π (E) 10π Attachment: 20171219_0837_003.png From the diagram, we see that the radius of circle C is 8  4 = 4; thus, the circumference is 2π x 4 = 8π. Answer: D
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Re: In the figure above, what is the circumference of the circle with cent
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23 Apr 2018, 04:13
Bunuel wrote: In the figure above, what is the circumference of the circle with center C? (A) 2π (B) 4π (C) 5π (D) 8π (E) 10π Attachment: 20171219_0837_003.png Radius of circle = 8  4 = 4 Circumference = \(2πr\) \(2*4*π\) \(8π\) (D)
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