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Numero de diagonales = n(n- 3)/2 (Donde n = numero de lados)
Por ser octagono n = 8 lados
Numero de diagonales = 8( 8 - 3)/2
Numero de diagonales = 8(5)/2 = 40/2 = 20
Respuesta.
El octagono tiene 20 diagonales