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La = ¼πD²
Ls = πrs
Ls = ½πDs
s = garis pelukis
s = √(r² + t²)
s = √(¼D² + t²)
t = √(s² – r²)
t = √(s² – ¼D ²)
Volume
V = ⅓ La t
V = ⅓ πr² t
t = 3V / πr²
t = 12V / πD²