I'm a little bit curious about using the formula. So for finding the area of a circle we use the normal formula, pi*r². But after doing this chapter, I wonder if you could do this one and get the same answer:
The normal formula for finding the area of a sector is: half * r² * theta and I'm replacing the theta with 2pi, so for the hole circle (360° = 2pi radians)
If they give us in a question the area of the major sector and the angle of the minor sector, how can I find the radius?
fanks in advance
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C2 - Radians watch
- Thread Starter
- 03-04-2011 10:22
- 03-04-2011 10:52
1) Simplify the new formula, it's exactly the same thing.
2) Major angle = 2pi - minor angle
area = r^2*major angle/2
rearrange to get a formula for r and substitute in.