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b)P=(a+b)h/2, a
c)P=πr(r+l), l
ad 1.
R^2 = V / (pi * H)
R = pierwiastek (V / (pi * h))
ad 2.
2P = (a + b) * h
2P = ah + bh
ah = 2P - bh
a = (2P - bh) / h
ad 3.
P = pi * r * (r + l)
P = pi * r^2 + pi * r * l
pi * r * l = P - pi * r^2
l = (P - pi * r^2) / pi * r