Jawabanmu

2014-04-07T20:42:59+07:00
2014-04-07T21:04:35+07:00
Pjg tali busur/kel = tembereng/luas 7,85/2.phi.. r = tembereng/phi. r.r 7,85/2=tembereng/r 2 tmbrg=7,85×r 2tmbrg= 7,85×5 2tmbrg= 39,25 tembereng = 19,625