working on a similar applet

for learning:

Add two vectors to determine a resultant by a graphical method
taken from http://www.seab.gov.sg/SEAB/oLevel/syllabus/2009_GCE_O_Level_Syllabuses/5058_2009.pdf

work in progress.....


and then for
add and subtract coplanar vectors.
taken from http://www.seab.gov.sg/SEAB/aLevel/syllabus/2008_GCE_A_Level_Syllabuses/8866_2008.pdf