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#1 2006-11-22 04:40:44
- unique
- Member
- Registered: 2006-10-04
- Posts: 419
central angle
the central angle of a sector of a circle is 0.6 radian.
find the area of the sector if the radius is 4 meters.
i did:
0.6 = 0.6 / 360 * pi(4)^2 = 0.026666666
correct?
Desi
Raat Key Rani !
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#2 2006-11-22 06:03:56
- mathsyperson
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- Registered: 2005-06-22
- Posts: 4,900
Re: central angle
Almost. You would be correct if the angle of the sector was 0.6 degrees, but it's actually 0.6 radians.
That means that instead of dividing by 360, you divide by 2π, which actually makes the working out a bit easier.
Area = 0.6/2π * π*4² = 0.6/2 * 16 = 0.48m².
Why did the vector cross the road?
It wanted to be normal.
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