Expression 4: "p" . "y" left bracket, "i" Subscript, "n" "d" "s" , Baseline , right bracket tilde 1 half minus "c" Subscript, 1 , Baseline "p" . "x" left bracket, "i" Subscript, "n" "d" "s" , Baseline , right bracket Superscript, negative 0.5 , Baselinep.yinds~12−c1p.xinds−0.5
4
Expression 5: "f" left parenthesis, "x" , right parenthesis equals 1 half minus 0.5 9 7 6 5 "x" Superscript, negative 1 half , Baselinefx=12−0.59765x−12
5
Expression 6: polygon left parenthesis, left parenthesis, "p" . "x" , 0 , right parenthesis , left parenthesis, "p" . "x" , "p" . "y" minus "f" left parenthesis, "p" . "x" , right parenthesis , right parenthesis , right parenthesispolygonp.x,0,p.x,p.y−fp.x