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    Mornin,

    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:

    (r²*2pi)/2

    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)

    Problem# 2:

    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:cool:
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    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.
 
 
 
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Updated: April 3, 2011

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