Jawabanmu

2014-02-14T18:47:32+07:00
Panjang busur = <POQ/360drjt x keliling lingkrn
84.78 = 1080/360 x 2 \pi r
84.78= 3x2x3.14.r
84.78=18.84r
r=84.78/18.84=4.5
1 1 1
2014-02-14T19:56:57+07:00