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Un=a.r pangkat n-1
108 =4.r pangkat 4-1
108/4= r pangkat 3
27=r pangkat 3
r = 3√27 = 3
S4=4(3 pangkat 4 -1 ) / 3-1
=4(80) / 2
=320/2
=160cm
a = 4 cm
U4 = 108 cm
U4 = ar^3
108 = 4.r^3
r^3 = 108/4
r =
r = 3
Panjang tali mula-mula :
S4 = a(r^4-1) / r-1
= 4(3^4-1) / 3-1
= 4(80) / 2
= 160 cm
Mohon maaf apabila ada kesalahan