rt 90 means rotating clockwise (ck) 90 deegree and if someone ask you what i rt 180 the answer is very easy rotate 180 deegree clockwise same like rt 270
Full form of LAN is Local area network,WAN=Wide area network,MAN=Metropolitian network. DO you know PAN=personal area network.Example:bluetooth.
The full form of LAN is local area network, MAN is metropolition area network and WAN is wide area network. Do you know about PAN???It's full form is personal area network.