Три вопроса с решением (словесным хотяб) : 1.две хорды окружности точкой пересечения делят друг друга пополам. верно ли, что эта точка – центр окружности? 2.две точки лежат по одну сторону от прямой. докажите, что есть не более одной окружности с центром на данной прямой, которая проходит через данные точки? в каком случае такой окружности не будет? 3. точки а, в, с и d в указанном порядке расположены на окружности. на плоскости взяли такую точку м, что ам = см, вм = dм. обязательно ли точка м находится в центре окружности? 3.1.тот же вопрос, что и в предыдущей , но для другого расположения точек на окружности.

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ответ:   a║b.

Объяснение:

"Определите параллельны ли прямые а и б если угол пять равен 126 градусов и угол 4 / угол 2 = 7 / 3.​"

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При пересечении двух прямых третьей образуется 8 углов:

Смежные, сумма которых равна 180° и равные вертикальные углы.

∠4:∠2=7:3. смежные углы.

Пусть ∠4=7х, а ∠2= 3х.  ∠4+∠2=180°.

7х+3х=180°;

10x=180°;

x=18°;

∠4=7x=7*18=126°;

∠2=3x=3*18=54°.

При параллельных прямых ∠5=126°  должен быть равен ∠4, как накрест лежащие  при a║b  и секущей с.

∠4=126° следовательно прямые a и b параллельны.