Procedure
Step 1) Draw LU=4.5 cm
Step 2) Draw by using compass, make first arc than second arc after that draw a bisector of first and second arc you will get
Step 3) Draw
Step 4) Draw an arc with U as centre and radius 4.5 cm in compass draw the arc which cuts ray D
Step 5)Draw an arc with L as centre and radius 4.5 cm in compass draw the arc which cuts ray O
LUDO is required square