Panjang kayu terpendek = a
Panjang kayu terpanjang = ar⁴
r⁴ = 320/20 = 16
r = 2
S5 = 20(32 - 1)/(2 - 1) = 620 cm (D)
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Panjang kayu terpendek = a
Panjang kayu terpanjang = ar⁴
r⁴ = 320/20 = 16
r = 2
S5 = 20(32 - 1)/(2 - 1) = 620 cm (D)