Oftentimes, I don't think we can feel them. I had one that was also 9cm but my only symptoms were one day of pain and weight gain of 3 or 4 lbs. Is surgery planned? If so, make sure that your surgeon does lots of cystectomies and is going to remove just the cyst so you can keep your ovary since our ovaries produce hormones our whole lives for all aspects of health.
You may or may not be able to feel the ovarian cyst. To confirm the measurements, you can request a copy of the images on a CD and view them on your home computer; usually ultrasound images will have the measurements saved onto the images so you can just scroll through the images until you find a large oval-shaped black structure labeled 9.4 x 7.5 x 6.6 cm.
Assuming these measurements are correct, there are published guidelines on next steps (see below). These take into account various factors, such as whether you are symptomatic or asymptomatic, pre- or postmenopausal, and the size and appearance of the cyst. Single thin septation is usually ok, but multiple thin septations are usually more concerning. Any cyst larger than 7 cm in either pre- or postmenopausal women warrants further evaluation (e.g., MRI) or surgical evaluation. Most likely you are heading towards surgery and most likely it is going to turn out to be a benign neoplasm (e.g., serous cystadenoma).
For more info: https://pubs.rsna.org/doi/full/10.1148/radiol.10100213 (see Figures)