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=luas persegi panjang - (luas separuh lingkaran+luas segitiga)
=50x28 - ((22/7 x 14 x 14 x 1/2) + (16 x 28 x 1/2))
=1400 - ((22 x 14 ) + (16 x 14))
=1400 - (308 + 224)
=1400 - 532
=868
jawab C. 868