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apotema: 4.1
area:(4.1x p)/2=55.59
area:2.05x p/2=55.59
te lo dejo hasta alli tu ya sabes como seguirlo facil :D
Area = 55, 59cm²
Apotema = 4,1cm
Area = Perimetro por apotema/2
55,59cm² = Perimetro * 4,1cm/2
55,59cm² * 2 = perimetro * 4,1cm
111,18cm² = Perimetro * 4,1cm
111,18cm²/4,1cm = Perimetro
27,11cm = perimetro
Octagono = 8 Lados
Perimetro = 8 * L (L = Longitud de lado)
27,11cm = 8 * L
27,11cm/8 = L
3, 38875cm = L
Respuesta.
El lado del octagono vale 3,38875cm aproximadamente