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(B+b) * h
A= ------------ = (Lo que tienes que hacer es reemplazar esos valore en
2 la fórmula)
(5+2,4) * 2
A = -------------- = (Ahora solo tienes que resolver)
2
(7,4) * 2
A= ------------ = > A= 7,4 cm^2
2
Espero haberte ayudado ... :)