Jawabanmu

2014-06-06T18:05:55+07:00
Besar sudut pusat 72*, panjang busur 6 cm,
 72/360 x keliling = 6
keliling = (6 x 360)/ 72 = 30 cm

Keliling = 30 cm , panjang busur 10 cm , besar sudut pusat = ?
x/360 x keliling = panjang busur 
x/360 x 30 cm = 10
x = 10 x 360 / 30
x = 120