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u8 = 54 cm
S8 = (n/2)(u1+u8)
= (8/2)(5+54)
= 4.59
= 236 cm
Ditanya : panjang mula-mula?
Dijawab :
S8=1/2.8(5+54)
S8=4 x 59
S8=236 cm
Jadi panjang tali mula2 adalah 236 cm