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L1=1/2×8×15
L1=60 cm^2
L2=1/2×a×t
L2=1/2×8×10
L2=40 cm^2
L diarsir=1/2×a×t
Ld=1/2×8×4
Ld=16 cm^2
L tidak diarsir= L1+L2-2(Ld)
L tidak diarsir= 60+40-2(16)
L tidak diarsir= 100-32
L tidak diarsir= 68 cm^2 (A)