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kategori : keliling bangun datar
K Lingkaran = 2 π r
K lingkaran = 2 . 3,14 . 10
K lingkaran = 62,8 cm
K persegi panjang = 2 × ( p + l )
K persegi panjang = 2 × ( 50 + 20 )
K persegi panjang = 2 × 80 = 160 cm
K yang diarsir = 160 - 62,8 = 97,2 cm