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= 1/3 . 22/7 . 3,5 . 3,5 . 15
= 192,5 cm³
s = √3,5² + 15²
s = √ 12,25 + 225
s = √237,25
s = 15,4 cm
Lp = phi . r(r + s)
= 22/7. 3,5(3,5 + 15,4)
= 207,9 cm²