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A-R-Q
 Post subject: [MATA999] Angle is subtended...
PostPosted: Sat, 1 Oct 2011 15:09:42 UTC 
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Quote:
A circle has radius 2.5 m.
What angle is subtended at the center of the circle by an arc 3 m long? (Round your answer to one decimal place.)


They want the answer in degrees.
I dont know what I did wrong below:
arclength/ circumf of circle = angle/360
deg 3/2pi(2.5) = angle/360

Cross multiplied to get 360(3) = 2(pi)2.5*angle

Isolate for angle 1080/5pi = angle 68.7 deg = angle


What did I do wrong?


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aswoods
 Post subject: Re: [MATA999] Angle is subtended...
PostPosted: Sat, 1 Oct 2011 15:45:07 UTC 
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Joined: Mon, 23 Feb 2009 23:20:33 UTC
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Location: Adelaide, Australia
I suspect 68.7549354...° should have been rounded up to 68.8°.
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