Предмет: Геометрия, автор: nastya39497

Допоможіть будь ласка! Дуже терміново!

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Автор ответа: LN330068
0

Ответ:

Номер 8

Угол между вершинами ромба,проведённые из его тупого угла,равен острым углам ромба

Противоположные углы ромба равны между собой

<1=<3=60*
<2=<4=(360-60•2):2=120*
Номер 9

Биссектриса ВК отсекает от параллелограмма равнобедренный треугольник АВК,где АВ=АК=4X

Противоположные стороны параллелограмма равны между собой

АВ=СD=4X

BC=AD=4X+3X=7X

Периметр-сумма всех сторон

(4Х+7Х)•2=66

22Х=66

Х=66:22

Х=3

АВ=СD=3•4=12 см

ВС=АD=3•7=21 см

Объяснение:

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