Jawabanmu

2014-05-31T21:39:07+07:00
Dik : panjang busur = 10 cm
sudut pusat= 36

dit: r = ...

panjang busur = sudut pusat / 360 x keliling lingkaran
10 cm = 36 / 360 x phi x diameter
10 cm = 1/ 10 x phi x d
100 cm = 3,14 x 2r
31,85 cm = 2r
r = 15, 93 cm