Seutas tali menjadi enam bagian sehingga bagaian bagiannya membentuk barisan geometri jika panjang tali terpendek 9cm dan panjang tali terpanjanv 288m panjang tali mula mula adalah
SriKaryati
A = 9 U6= 288 n =6 Un = ar^n-1 288 =9 r^5 288/9 =r^5 32 =r^5 2^5 =r^5 r = 2 S6 = a(r^6 -1)/r-1 = 9.(2^6 -1)/2-1 = 9 (64 -1) = 9. 63 =567 m jd pnjng mula mula 567 m
Un = ar^n-1
288 =9 r^5
288/9 =r^5
32 =r^5
2^5 =r^5
r = 2
S6 = a(r^6 -1)/r-1
= 9.(2^6 -1)/2-1
= 9 (64 -1)
= 9. 63 =567 m
jd pnjng mula mula 567 m