Looks female by plastron and anal scutes. That tail is long though. You can soak the tortoise and massage its tail, and hold it like you are and see if it will flash. Radiata is very tough to sex. Even at this size.
Thanks sir, yeah its hard to sex may friend has two 14" that has short tails, he thinks that both are females, but last month he saw pennis comming out, thanks, for the pressing tip, maybe you can help me by sending me a video in how to do it sir? Were just a newbies sir