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380-70+70
380-140
240
240/2:120
120+120+70+70:380
entonces suu base es de 120 cm
Su perímetro= 2P=380.....2(A+B)=380
A+B=190
Dato:
su altura es de 70cm=A
Por lo tanto:
70cm + B = 190cm
B= 120cm