a = 7 n = 6 Un = 224 cm Un = a x r^(n-1)b 224 = 7 x r^(6-1) 224/7 = r^(5) 32 = r^5 2^5 = r^5 2 = r jumlah tali seluruhnya(mula-mula) Sn = a(r^n -1) ./ r-1 = 7 (2^6 - 1) / 2 - 1 = 7 ( 64 -1)/1 = 7 ( 63) = 441
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a = 7
n = 6
Un = 224 cm
Un = a x r^(n-1)b
224 = 7 x r^(6-1)
224/7 = r^(5)
32 = r^5
2^5 = r^5
2 = r
jumlah tali seluruhnya(mula-mula)
Sn = a(r^n -1) ./ r-1
= 7 (2^6 - 1) / 2 - 1
= 7 ( 64 -1)/1
= 7 ( 63)
= 441