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a) (3+4+5) 9
12 . 9
144 cm²
b) (23 +38+47+45) 56
153 . 56
8568 mm²
c) (6,3 + 7,6 + 6,3) 8
20,2 . 8
161,6 cm²
9 x 5 + 9 x 4 + 3 x 9 = 168 + 12 = 180 cm
b. = 12420 mm2
c = 199 , 6 cm2