My math teacher
I have a math teacher.He is xx(年龄）years old.(介绍长相）Hisa nose is big（他的鼻子是大的,根据你们老师的情况来写）,eyes are small,a mount is wide.He has a round fece. His telephone number is xxxx(电话号码）
Ps:如果老师是女的,那么改为she和her