Предмет: Геометрия, автор: anastaas5

Найти медиану равнобедренного треугольника с основанием 30 см и боковым стороны 17 см, проведенную к основанию

Ответы

Автор ответа: Tetragrammaton
0
Медиана в равнобедренном треугольнике является высотой. Получаем прямоугольный треугольник. Находим медиану по теореме Пифагора.
Приложения:
Автор ответа: anastaas5
0
в равнобедренной трапеции основания равны 7 и 25 см, а диаганаль равна 20 см. Найти площадь трапеции
Автор ответа: Tetragrammaton
0
Проводим высоты, образуютя отрезки. АН, HF, FD. АН=FD=9. HF=7. Диагональ и высота образуют прямоугольный треугольник, где гипотенуза равна 20, а один из катетов равен 16. По теореме Пифагора находим высоту. 400-256=144. То есть 12. S=1/2*(7+25)*12=192.
Автор ответа: anastaas5
0
биссектриса острого угла прямоугольного треугольника делит противоположный катет на отрезки 3см и 5см,найти периметр треугольника
Автор ответа: anastaas5
0
дан треугольник АВС, плоскость, параллельная прямой АВ, пересекает сторону АС этого треугольникк в точке Д , а сторону ВС в точке Е. Найти длинну отрезка ДЕ, если АВ=30 дм и АД:АС=2:5
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