Use an appropriate font size (it should not be too small a size 28) the font that the reader should be used (if possible, it should be tested by the show presentation in room)
Use appropriate font size (Should not be too small to size 28) font should be used to read the clear. (If possible, test by viewing presentations in the back room).
Use the font size is appropriate (not small overdose 28) pattern, should choose to read clearly. (if possible should be tested by observation presented in back room).