В треугольнике АВС точка М – середина ВС. Биссектриса угла АМВ пересекает сторону АВ в точке Е, а биссектриса угла АМС пересекает сторону АС в точке D. Найти ME2 + MD2 если МС=8 см, а DC:AD=3:5.​

Thanksgiving Day is a national holiday celebrated in Canada and the United States. It was originally celebrated as a day of giving thanks for the blessing of the harvest and of the preceding year. Thanksgiving is celebrated on the second Monday of October in Canada and on the fourth Thursday of November in the United States. Several other places around the world observe similar celebrations. Although Thanksgiving has historical roots in religious and cultural traditions, it has long been celebrated in a secular manner as well. Prayers of thanks and special thanksgiving ceremonies are common among almost all religions after harvests and at other times. The Thanksgiving holiday's history in North America is rooted in English traditions dating from the Protestant Reformation. It also has aspects of a harvest festival, even though the harvest in New England occurs well before the late-November date on which the modern Thanksgiving holiday is celebrated. In the English tradition, days of thanksgiving and special thanksgiving religious services became important during the English Reformation in the reign of Henry VIII and in reaction to the large number of religious holidays on the Catholic calendar. Before 1536 there were 95 Church holidays, plus 52 Sundays, when people were required to attend church and forego work and sometimes pay for expensive celebrations.