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U5 = 2,4 m
Sn = n/2 (a+Un)
S5 = 5/2 (1,2+2,4)
S5 = 2,5 (3,6)
S5 = 9
maka sblm dipotong = 9 meter
jumlahnya : 1,2 + 1,5 + 1,8 + 2,1 + 2,4 = 9 m
semoga bermanfaat