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Primero calculemos MB
Con la funcón coseno
cos(x)=cateto adyecente/hipotenusa
cos(53°) = MB/40
40*cos(53°) = MB
24,07 = MB
Ahora de la misma manera calculemos NB
cos(45°) = NB/40
cos(45°)*40 = NB
28,28 = NB
Pero NB = MN +MB
Despejamos MN
MN = NB - MB
MN = 28,28 - 24,07
MN = 4,2
Redondeado MN es igual a 4