Solve for W, K, l, V, r, h (complex solution)
r\in \mathrm{C}
W=Kl
K\in \mathrm{C}
l\in \mathrm{C}
V=\pi hr^{2}
h\in \mathrm{C}
Solve for W, K, l, V, r, h
r\in \mathrm{R}
W=Kl
K\in \mathrm{R}
l\in \mathrm{R}
V=\pi hr^{2}
h\in \mathrm{R}
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