您即將從本網站離開,並前往https://www.shaalaa.com/question-bank-solutions/in-triangle-abc-angle-b-is-obtuse-d-and-e-are-mid-points-of-sides-ab-and-bc-respectively-and-f-is-a-point-on-side-ac-such-that-ef-is-parallel-to-ab-show-that-befd-is-a-parallelogram-theorem-of-midpoints-of-two-sides-of-a-triangle_95566