<br/><br/>Please tell me which one is correct. <br/><br/>A PC is <font color="#ff0000">on</font> the right corner of the desk.<br/><br/>A PC is <font color="#ff0000">at</font> the right corner of the desk.<br/><br/>A PC is <font color="#ff0000">in</font> the right corner of the desk.<br/><br/>And, are the following sentences correct?<br/><br/>A PC is on/at/in the back-right corner of the desk.<br/><br/>A PC is on/at/in the near-right corner of the desk.<br/><br/>Thank you in advance for your help.<br/><br/><br/>