... Problems in plane geometry followed by Problems in solid geometry this task is successfully perfomed. In the process of writing the book the author used the books and magazines published in the ... line passing through the midpoints of MA and OB is perpendicular to that passing through the midpoints of MB and OA.1.12. a) Points A, B, and C lie on one straight line; points A1, B1, and ... Through point Q inside triangle ABC draw lines DE, F G and HI parallel to BC,CA and AB, respectively, so that points F and H would lie on side BC, points E and I onside AC, points D and G on...