Pengertian Lingkaran

Lingkaran adalah kedudukan titik-titik yang jaraknya sama terhadap titik tertentu.

Yang dimaksud titik tertentu di sini adalah titik pusat, sedangkan jaraknya sama di sini maksudnya adalah jari-jari lingkaran.


Misalkan diberikan sebuah lingkaran dengan pusat(0, 0) sebagai berikut













Dari gambar yang ada maka dapat disimpulkan dengan pythagoras sebagai berikut
x2 + y2 = R2

Jika lingkaran memiliki pusat (a, b) maka bisa digambar sebagai berikut










dengan menggunakan rumus pithagoras maka bisa diambil kesimpulan sebagai berikut

(x - a)2 + (y - b)2 = R2

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