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lingkaran = vi(tw kan simbol nya) kali diameter
d= diameter/2r/2Xr
luas=vi.r.r/ vi x r x r
keliling=vi.d/vi.2r
catatan: vi= 22per7/3,14
jika r/d=dapat dibagi 7 menggunakan vi yg 22÷7/22 per7
volume tabung: luas alas X tinggi tabung