Точка E – середина боковой стороны CD трапеции ABCD. Параллельно этой стороне через вершину В провели прямую, которая пересекла отрезок AE в точке К. Найдите отношение оснований трапеции, если АК: EK = 3:5.
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Математика 5 - 9 классы
13.12.2019 18:05
Дан ромб ABCD, точка O пересечения диагоналей AC и BD, короткая диагональ равна стороне ромба.
1) Угол между векторами BA−→ и BD−→− равен °;
2) угол между векторами CB−→− и DA−→− равен °;
3) угол между векторами AB−→ и CA−→− равен °;
4) угол между векторами AD−→− и DB−→− равен °;
5) угол между векторами OB−→− и OC−→− равен