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luaas layang2=1/2×d×d=1/2×7×28=98cm2
308-98=210cm2
luas lingkaran = 22/7 x 14 x14
= 616 cm²
luas layang² = diagonal 1 x diagonal 2
luas layang² = 14 x 28 = 392cm²
luas bayang² = 616-392
luas bayang² = 224 cm²