Предмет: Геометрия, автор: Аноним

Помогите Решить срочно!!!!!!!!

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Автор ответа: cos20093
0
(2*m)^2 = 2*(a^2 + b^2) - c^2; с - сторона, к которой медиана m проведена.
Я тут столько раз выводил эту простенькую формулку, что уже устал повторять :) Треугольник достраивается до параллелограмма (медиана продолжается за сторону на свою длину и концы соединяются). Потом применяется теорема косинусов к двум треугольникам, на которые делят параллелограмм диагонали c и 2m. Остается только сложить.
В данном случае c = b, b^2 = (2*m)^2 - 2*a^2 = 100 - 2*16*2 = 36; b = 6;
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Police Force in the United States

Historians suggest that the first modern police in the United States did not come into existence until 1833 in the city of New York.

The first municipal police agencies consisted of nightwatchmen whose responsibility was to protect property during the evening and early morning hours. Crime continued to increase, however, and gradually there were demands to hire men to provide similar protec­tion during the daylight hours as well. Thus, by the 1830s and 1840s these two types of police were combined to form a unified, more ef­fective municipal police agency. The modern police departments came into existence, especially in the years following World War I. Since 1920 municipal police agencies have increasingly grown in person­nel and responsibilities. Special training and more selective recruit­ment practices have heen developed to go hand in hand with the use of such technological developments as the automobile, the individual police radio, and the computer. The great part of police work does not involve crime-fightng situations but rather consists of both ser­vice and peacekeeping activities.

Service functions include directing traffic and enforcing traffic regulations, answering accident calls, aiding the sick, helping to find a lost child or rescue a lost pet, recovering stolen property, and re­porting fires. These are all services performed to assist the public.

Peacekeeping functions of the police are designed to maintain public order.

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