4*pi*r^2(1/(5*pi))=200

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Solution for 4*pi*r^2(1/(5*pi))=200 equation: 


D( r )

5*pi = 0

5*pi = 0

5*pi = 0

5*pi = 0

r belongs to the empty set

r in (-oo:+oo)

4*pi*(1/(5*pi))*r^2 = 200 // - 200

4*pi*(1/(5*pi))*r^2-200 = 0

4/5*r^2 = 200 // : 4/5

r^2 = 250

r^2 = 250 // ^ 1/2

abs(r) = 5*10^(1/2)

r = 5*10^(1/2) or r = -(5*10^(1/2))

r in { 5*10^(1/2), -(5*10^(1/2)) }

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