Keliling Lingkaran ( KEVIN / X-L / 23 )

Mengapa keliling lingkaran = 2 pi . r, buktikan

JAWAB :

360 derajat = 2 . pi . rad

teta = 1 rad ---- Jika s = r

teta = 1 rad . 2 pi ---- s = 2 pi . r

Sehingga, teta = 2 pi . rad === Keliling lingkaran = 2 pi . r

Kevin C K (X-L/23)