[計量] 一題新的印度數學
7. Given a smaller circle inscribed in the larger circle, if.... 'r' is a
point on the smaller circle, 's' is a point on the larger circle, 'o' is the
center of both the circles, or = x, rs = y, and if the area of the smaller
circle is equal to the area of the big circle minus the area of the small
circle, then what is value of y in terms of x?
小圓半徑x 大圓半徑x+y 小圓面積=大圓-小圓面積
x^2pi=(x+y)^2pi-x^2pi
-->x^2=x^2+2xy+y^2-x^2
-->x^2=y^2+2xy
-->y=sqrt(x^2-2xy)
我算出來是這樣，不過看起來不太對/_\
請問這樣算對嗎??
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