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Pelajaran :MatematikaKelas :8
Bab :6
Nama Bab :Lingkaran
Kode mapel:2
Kode :8.2.6
Jawab:
L=πr²
=(3,14)(10cm/2)²
=3,14(100cm²/4)
=3,14(25cm²)
=78,5cm²
jadi jawabannya adalah yang (b)