You can use the text tool to create labels. Spreadsheets A spreadsheet is a giant table. Formulae are written based on the cell address. Whenever you change a value in either a2 or b2 the result displayed as the sum changes. This was created by copying the contents of cell c2 into c3.
All addresses are relative.
However the argument must be in radians. You will need to use this spreadsheet to write a small module to predict vector addition.