Площадь прямоугольника равна 36см2. Найти площадь четырехугольника, вершинами которого являются середины сторон данного прямоугольника.

два тела массой 3 и 4 кг имеющие одинаковые по величине скорости 14 м/c сталкиваются с друг другом под прямым углом.Чему равна кинетичесская энергия тел сразу после неупругово столкновения.

шипшина- який це тип плода? ягода чи ні?

open the brackets and use the correct form my friend was sure that ferdinand magellan (discovered, had discovered) australia our history teacher explained to us that the revolutionary war in america (took, had taken) place in the 18th century.betty knew that she (did had done) everything she could to win the competition.we asked professor smith when he (came, had come) to moscow how many places of interest he already (saw, had seen).little john believed that canada (is was)in the south of america continent.we all wanted to know where in the new york the statue of liberty (is, was) situated.the children asked what cities in the usa we (saw, had seen).father told me that i (made had made) a mastake in my school test.we all knew that germany (declared, had declared) war on several european countries in 1941.he said he always (supported, had supported) me.not all the pupils knew that the us president (is was) the commander in chief of the country's armed forces.ПОМОГИТЕ! НУЖНО СРОЧНО!