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8^2=17^2- (10+ x )^2
64 =289 - (10 + x)^2
64 - 289 = -(10 + x)^2
-225 = -(10 + x)^2
akar -225 = -(10 + x)
-15 = -(10 + x)
-15+10= -x
-5 = -x atau 5 = x
jadi jari'' lingkaran kedua adl 5 cm