Panjang Busur = 108/360 X K
84,78 = 108/360 X 2 X phi X r
84,78 = 108/360 X 2 X 22/7 X r
84,78 = 6/10 X 22/7 X r
84,78 = 1,89r
r = 84,78/1,89
= 44,9 cm
Panjang Busur = 108/360 X K
84,78 = 108/360 X 2 X phi X r
84,78 = 108/360 X 2 X 22/7 X r
84,78 = 6/10 X 22/7 X r
84,78 = 1,89r
r = 84,78/1,89
= 44,9 cm