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L = 1/4 × 3,14 × 20 ×20
L = 3,14 × 5 × 20
L = 314 CM
K = PHI × D
K = 3,14 × 20
K = 62,8 CM
2. L = 1/4 X PHI X D^2
L = 1/4 × 3,14 × 40 × 40
L = 3,14 × 10 × 40
L = 1256 CM
K= PHI X D
K= 3,14 × 40
K = 125,6 CM