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- Barisan dan Deret -Deret tak hingga
*Cari lintasan bola turun
a = 15 m
r = 4/5
S~ turun = a/(1-r) = 15 / (1-4/5) = 15/(1/5) = 15.5 = 75 m
*Cari lintasan bola naik
a = 4/5 x 15 m =12 m
r = 4/5
S~ naik = a/(1-r) = 12/(1-4/5) = 12/(1/5) = 12x5 = 60 m
Panjang lintasan = S~ turun + S~ naik = 75 m + 60 m = 135 m
semoga membantu
-vin