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Lp = 4× 3,14 × 50 ×50
Lp = 31,400 cm persegi
b. Lp = phi×r (s+r)
Lp = 3,14 × 9 (12+9)
Lp = 28,26 (21)
Lp = 593,46 cm persegi
c. Lp = 2 × phi × r (r+t)
Lp = 2 × 3,14 × 0,75 (0,75 + 6)
Lp = 4,71 (6,75)
Lp = 31,792 cm persegi