This phase II trial studies the side effects of giving intensity-modulated radiation therapy together with cisplatin and bevacizumab followed by carboplatin and cisplatin and to see how well they work in treating patients who have undergone surgery for high-risk endometrial cancer. Specialized radiation therapy that delivers a high dose of radiation directly to the tumor may kill more tumor cells and cause less damage to normal tissue. Drugs used in chemotherapy, such as cisplatin, carboplatin, and paclitaxel, work in different ways to stop the growth of tumor cells, either by killing the cells or by stopping them from dividing. Monoclonal antibodies, such as bevacizumab, can block the ability of tumor cells to grow and spread. Bevacizumab may also stop the growth of tumor cells by blocking blood flow to the tumor. Giving intensity-modulated radiation therapy together with chemotherapy and bevacizumab after surgery may kill any tumor cells that remain after surgery.