Знайти кількість сторін опуклого многокутника, якщо кожний його зовнішній кут дорівнює 24 градуси.

∠аос=∠bod(как вертикальные)

т.к. cd и ab-диаметры, то co=od=ob=oа

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по углу и двум прилежащим сторонам треугольники aco и bod равны.

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т.к. ∠b=∠a и аb - секущая ,то ac║bd

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