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=20×20
=400
luas 1/2 lingkaran=1/2 pi× r×r
=1/2×3,14×10×10
=157
luas segitiga=1/2×a×t
=1/2×20×8
=80
luas daerah yang diarsir
=luas persegi-(luas 1/2
lingkaran+l.segitiga)
=400-(157+80)
=400-237
=363 m kuadrat