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= ½ . (35 + 47) . 22
= ½ . 82 . 22
= 41 . 22
= 902 cm²
8) L = phi . r²
= 3,14 . 31,5 . 31,5
= 3115,7 cm²
9) L = ½ . d1 . d2
= ½ . 34 . 58
= 986 cm²
10) L = ½ . (a + b) . t
= ½ . (35 + 44) . 31
= ½ . 79 . 31
= 1224,5 cm²