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2304=2704-(30-r2)kuadrat
(30-r2)kuadrat=2704-2304
(30-r2)kuadrat=400
(30-r2)kuadrat=20kuadrat
30-r2=20
r2=10
(30 - r)² = 2704 - 2304
(30 - r)² = 400
30 - r = √400
30 - r = 20
r = 10