Expression 4: "b" equals StartFraction, 1 Over 2 "a" , EndFractionb=12a
equals=
11
4
(x=${a}, y=${b}) "P" equals left parenthesis, "a" , "b" , right parenthesisP=a,b
Label:
5
Expression 6: polygon left parenthesis, left parenthesis, negative "a" , 0 , right parenthesis , left parenthesis, "a" , 0 , right parenthesis , "P" , left parenthesis, negative "a" , "P" . "y" , right parenthesis , right parenthesispolygon−a,0,a,0,P,−a,P.y