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1177,5 = 3,14 × s × 15
1177,5 : 3,14 = s × 15
346,32 = s × 15
346,32 : 15 = s
23,08 cm = s
b. Lp = phi × r (s+r)
Lp = 3,14 × 15 (23,08 + 15)
Lp = 47,1 (38,08)
Lp = 1793,56 cm persegi