Well you can't change your answer for the drag and drop i mean you can but if you try to go back and try to see your question again for drag and drop then your answer is going to be deleted and then you had to redo the whole thing.
So i suggest please make your decision at the same time. Drag and drop are not hard i mean something like this
System.out.printf("Pi is approxmicately", Math.PI);
Pi is approximately
Place the value for PI 3.14
3.145
Something like that Good luck