1)
Обозначим коэффициент отношения радиусов х
Тогда один радиус равен 3х,второй - 5х
3х+5х=16
8х=16
х=2
3х= 6 см - это первы радиус
5х*2=10см - это второй радиус
2)
В четырехугольнике сумма его углов равна 360 градусов.
Два угла между касательными и радиусами равны по 90 градусов и сумма их 180 градусов.
Угол между касательными равен
180-130 =50 градусов
3)
Треугольник с такими углами - прямоугольный.
Центр описанной окружности лежит на его гипотенузе, и радиус окружности равен половине АВ
радиус 10:2=5 см
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