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S = π * r² * α/360° r = 5cm π= 3,14 α= 40°
S = 3,14 * 5cm * 5cm *40°/360° Simplificando el 40°
S = 3,14 * 5cm * 5cm /9°
S = 78,5cm²/9°
S =8,722cm²
Respuesta.
El area del sector circular es = 8,722cm²