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luas balok: p×l×t
: 20 cm×7cm×4cm : 560 cm³
luas ¼ lingkaran: π×r²×¼
: 3.14×20cm×20cm×¼ : 314cm³
luas gab : luas balok + luas ¼ lingkaran
: 560cm³ + 314 cm³ = 874 cm³