Предмет: Геометрия, автор: Lev1223

А и В - концы отрезка , M - середина. Найдите координаты А, если В(4;7) М (-3;-2)

Ответы

Автор ответа: fmif09

1

координаты середины отрезка равны полусумме соответствующих координат концов отрезка
пусть точка А имеет координаты (х; у), тогда:
(4+х)/2=-3
(7+у)/2=-2

4+х=-6
х=-10

7+у=-4
у=-11

А(-10; -11)

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