Draw a number line and make it from 11 to 12. for each tick add it by .1
Do you need the total or just interest?
Answer:
A point E is taken on OB such that OC= OE and draw EF perpendicular to OX or OX' .
Since,
< YOB= <XOA
Therefore, < OEF=<COD
Now, from the right- angled traingle EOF and right-angled traingle COD we get ,< OEF= < COD and OE= OX
hence, traingle EOF= Triangle COD ( Congruent)
Therefore, EF=OD, OF= DC, And OE= OC
