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L=½×(a+b)×t=½×(36+72)=×27
=½×108×27=½×2916=1458 cm
Luas bangun 2
L=½×(a+b)×t=½×(27+54)×18
=½×81×18=½×1458=729 cm²
Luas total =1458+729=2187 cm²