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d=40cm
r=1/2×40=20cm
t=63cm
Ditanya:
Lp.........???
Jawab:
Lp=2πr(r+t)
Lp=2×3,14×20(20+63)
Lp=6,28×20×83
Lp=6,28×1660
Lp=10424,8 cm²