Expression 18: polygon left parenthesis, "A" , "B" , "C" , "D" , right parenthesispolygonA,B,C,D
18
Expression 19: polygon left parenthesis, "A" , "B" , "C" , "D" , right parenthesispolygonA,B,C,D
19
Expression 20: left parenthesis, left bracket, negative 1 half , 1 half , right bracket plus "R" cos "t" , "R" sin "t" , right parenthesis−12,12+Rcost,Rsint
00
domain t Minimum:
less than or equal to "t" less than or equal to≤t≤