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B. Diameter Lingkaran = 40cm
Jari- jari lingkaran = = = 20cm
Luas = ( x 3,14 x 20cm x 20cm ) + ( 20cm x 20cm )
= 628 cm² + 400cm² = 1028cm²
maaf jika ada jawaban yang salah. mohon perbaikannya. dan sama sama <3