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Area del pentagono = 5 * areaΔ
Formula para hallar el area del triangulo equilatero.
AreaΔ = √3*L²/4 (L = 12cm)
AreaΔ = √3(12cm)(12cm)/4
AreaΔ= √3 * 144cm²/4 Simplificas el 4
AreaΔ = 36√3cm²
Area del pentagono = 5 * 36√3cm²
Area del pentagono = 180√3cm²
Respuesta.
El area del pentagono es de 180√3cm²