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Buku ini digunakan untuk kelas VIII pada mata pelajaran Matematika.
Lingkaran menjadi salah satu bangun datar yang tidak memiliki siku-siku. lingkaran kerap menemui benda-benda dalam bentuk lingkaran di kehidupan sehari-hari, seperti piring, ban mobil, alas cangkir, jam dinding, koin, dan masih banyak lagi.