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145 - 116 = 29
29 : 2 = 14,5
p=58 cm
dit: l
jawab:
k=2(p+l)
145= 2(58+l)
145= 116+2l
145-116= 2l
29= 2l
l= 29:2
l= 14,5 cm
betul gak ya?