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a = 10, r = 3/4
S~ jatuh = a/(1 - r) = 10/(1 - 3/4) = 10/(1/4) = 40 m
Lintasan naik : 15/2, 45/8, 135/32, ....
a = 30/4, r = 3/4
S~ = a/(1 - r) = (30/4) / (1 - 3/4) = (30/4) / (1/4) = 30 m
Panjang lintasan bola sampai berhenti = 40 m + 30 m = 70 m
Cara lain : jika r = p/q => panjang lintasan bola = (q + p)/(q - p) x tinggi
r = 3/4 => S = (4 + 3)/(4 - 3) x 10 m = 7/1 x 10 m = 70 m