Construct 40 degree angle usimg compass

It's not possible, Dude

The answer to your question is :-

Step 1:-Draw a line segment BC of any measurement. 

Step 2:-Now, B as centre and any radius draw an arc give it as arc (RS). 

Step 3:-Where the arc rs cut the line segment BC give that point as P.Now, with P as centre and same radius cut another arc which intersect the arc RS at point X. 

Step 4:-With X as centre and same radius cut another arc which intersect the arc RS at point Y. 

Step 5:-with X as centre and any radius cut an arc and now,Y as centre and same radius cut another arc which intersect the first arc. 

Step 6:-Now taking Z as centre and radius ZP cut another arc.Now taking P as centre and same radius cut another arc which intersect the first arc at point Q. 

Step 7:-Join BQ. 

hope it helps !
thumbs up !
 

Better do with a protactor

Please find this answer

I think you should follow the steps given by Kashish.
That will help you...