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a = 10 ; r = 3/4
S~ = a/(1-r)
S~ = 10/(1-3/4)
S~ = 10/(1/4)
S~ = 40 m
Deret pantul :
Pantul dari 3/4-nya dari 10 m
a = 7.5 ; r = 3/4
S~ = a/(1-r)
S~ = 7.5/(1-3/4)
S~ = 7.5/(1/4)
S~ = 30 m
Panjang lintasannya
S~ total = 40 + 30 = 70 m