Bangun Datar Rumus Lingkaran Keliling : diameter dikali phi (d x phi) atau phi dikali 2 jari-jari (phi x (r + r)Luas : phi dikali jari-jari dikali jari-jari (phi x r x r)phi = 22/7 = 3,14 Share on Facebook Share on Twitter Share on Google+ Share on LinkedIn
