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L=½×(A+B)×T=½×(8+12)×16=½×20×16
=½×320=160 cm2
BANGUN 2 (SEGITIGA)
L=½×ALAS×TINGGI=½×12×15=½×180
=90 cm 2
LUAS TOTAL=L1+L2=160+90=250CM