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576 = 676 - (8-r2)^2
(8-r2)^2 = 676 - 576
(8-r2) = √100
(8-r2) = 10
r2 = 10 +8
r2 = 18
(8-r)² = 676 - 576
(8-r)² = √100
(8-r) = 10
r = 10 +8
r = 18