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BC=CA-AB
BC²=√CA²-AB²
=√17²-15²
=√289-225
=√64
=8
BC 8 m
jadi kemiringan AC = BC/AB
=8/15
289 - 225 = BC^2
BC^2 = 64
BC= 8 cm
kemiringan , 8/15 (B)