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S = α * (πr^2)/360.
Podstawiasz r = 3 i S = 9π/5
Mnoożysz przez odwrotność S przez odwrotność: (πr^2)/360
Wiec α = (9π/5)*(360/9π)
Liczysz i mi wyszło 72stopnie.
r = 3 i S = 9π/5
(πr^2)/360
α = (9π/5)*(360/9π)=72stopnie.
:D
r = 3 i S = 9π/5
(πr²)/360
α = (9π/5)*(360/9π)=72⁰