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1) A) a = 7.7 = 49cm
B) a = 4.5 . 4.5 = 20.25
2) a = 15.15 = 225cm
3) a = 5.5 + 3.3 = 34cm
4) A) a = 7.4 = 28cm
B) a = 5.2 x 3 = 15.6cm
5) a = 90.60 = 5400cm