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Astotal = Aslateral + 2(Abase)
Donde:
El Aslateral = suma de todas las caras lateral
"29" sale por pitagoras y el "3" por los tres rectangulos
Asl = 3 (36 * 29)
Asl = 3132
Al ser la base un t.rectangulo sera :
Abase = 20*21/2
Abase = 210
Reemplazando:
Astotal = Aslateral + 2(Abase)
Astotal = 3132 + 2 (210)
Astotal = 3552