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sxs + 1/2 x a x t
12x12 + 1/2 x 12 x (20-8)
144 + 48
192 dm
maaf kalau salah
L segitiga =1/2xaxt
=1/2x12x8
=6x8
=48dm²
Lpersegi = sxs=12x12=144dm²
Luas bangun di gambar=144+48=192dm²(C)
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