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a. 3,14 x 5² =
3,14 x 25 = 78,5 cm²
b. 22/7 x 7² =
22/7 x 7 x 7 = 154 cm²
c. 3,14 x 10² =
3,14 x 100 = 314 cm²
d. 22/7 x 14² =
22/7 x 14 x 14 = 616 cm²
e. 3,14 x 20² =
3,14 x 400 = 1256 cm²