Предмет: Геометрия, автор: kj51

Центральный угол AOB опирается на хорду AB так,что угол AOB = 60, найдите длину хорды АВ ,если радиус окружности = 7.

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Автор ответа: cos7a

получится что треугольник AOB - равносторонний потому что: 1) боковые стороны (они же радиусы) равны.

значит углы при основании (прихорде AB) = 60 градусов так как сумма углов в треугольнике равна 180 градусов.

значит хорда = 7 потому что треугольник AOB - равносторонний

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