Хорды окружности АВ и СD пересекаются в точке Р. АВ= 30 см, АР= 24см, СР на 10 см меньше DP. Вычислите длину отрезка РD.

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There was a School Hobby Fair last week.We learnt a lot about likes and interests of the schoolchildren.Fifth former Petro Doroshenko has got an unusual collection.He collects rocks."Rocks are beatiful," - says Petro."Some of them have pretty colours.My smallest rock is the most interesting.My uncle found it near the Pacific Ocean.Its difficult to find a rock like this."

 Eight former Borys Ivanchuk has an interesting hobby :cartoon animation.He started this hobby when he was ten.His new cartoon is called Pensil Man."Making Pensil Man was a lot of work,"he said."First I had to make more than 2,000 drawings.Each one was just a little different.Then I used a camera to take a picture of each drawing.In the film the picture move very quickly.Pensil Man looks like he is moving."

  Boris is going to snow Pensil Man at school gym on Tuesday at 3 oclock in the afternoon.Dont miss the snow! 

Решите уравнение 2sin^2+3cosx-3=0. Укажите корни, принадлежащие отрезку {4пи;5пи}