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L = 1100 m
t = 27,5 cm
L = 1/2 × a × t
1100 = 1/2 × 27,5 × a
1100 = 13.75 × a
a = 1100 ÷ 13.75
a = 80 cm
1100m = a x 27,5m x 1/2 (kali silang )
2200m = a x 27,5m
a = 2200m/27,5m
a = 80m