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01 Aug 2017, 04:46
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In the spiderweb above, 18 straight threads meet at the center. What is the average (arithmetic mean) measure, in degrees, of the 18 nonoverlapping angles about the center?
(A) 18
(B) 20
(C) 22
(D) 25
(E) 28
Attachment:
2017-08-01_1349.png [ 55.44 KiB | Viewed 2254 times ]
01 Aug 2017, 04:52
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Angle across a point is 360 degree.
Since, there are 18 straight threads that meet at the center,
the average of the 18 non-overlapping angles at the center
is given by \(\frac{360}{18} = 20(Option B)\)
Since, there are 18 straight threads that meet at the center,
the average of the 18 non-overlapping angles at the center
is given by \(\frac{360}{18} = 20(Option B)\)
02 Aug 2017, 13:37
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Bunuel
In the spiderweb above, 18 straight threads meet at the center. What is the average (arithmetic mean) measure, in degrees, of the 18 nonoverlapping angles about the center?
(A) 18
(B) 20
(C) 22
(D) 25
(E) 28
Attachment:
2017-08-01_1349.png
We see that 18 angles make up a circle or 360 degrees. Thus, the average of each angle is 360/18 = 20 degrees.
Answer: B
