Jawabanmu

Jawaban paling cerdas!
2014-05-29T16:00:11+07:00
Luas lingkaran = phi x r^2 = phi x 6^2 = 36phi

luas juring = drajat juring / 360 drajat x luas lingkaran
3phi = j / 360 x 36phi
3phi = j x phi / 10
30phi = j x phi
j = 30 drajat

kliling lingkaran = 2phi x r = 2 x phi x 6 = 12 phi

panjang busur = 30 drajat/ 360 drajat x 12phi = 1/12 x 12 phi = phi