Sзакраш.=Sсек-Sтреуг.
R=AB/2*sin(AOB/2)
Scек=πR²(АОВ)*sin(AOB)/360
Sтреуг=R²*sin(AOB)/2
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Sзакраш.=Sсек-Sтреуг.
R=AB/2*sin(AOB/2)
Scек=πR²(АОВ)*sin(AOB)/360
Sтреуг=R²*sin(AOB)/2