Gynaecology & Obstetrics Which of the following describes the pelvic outlet A Angle of pubic arch is less than 90 degrees. B Base of posterior triangle is the coccyx. C Descending inferior pubic rami form lateral boundaries of posterior triangle. D Common base of the two triangles is formed by a line drawn between the two ischial tuberosities. 💡 Explanation Which of the following describes the pelvic outlet ✓ Correct Answer: D. Common base of the two triangles is formed by a line drawn between the two ischial tuberosities.