表达式10: polygon left parenthesis, "A" , "B" , "C" , right parenthesispolygonA,B,C
10
表达式11: polygon left parenthesis, "M" Subscript, "c" , Baseline , left parenthesis, "C" . "x" , "M" Subscript, "c" , Baseline . "y" , right parenthesis , "C" , right parenthesispolygonMc,C.x,Mc.y,C
11
表达式12: "M" Subscript, "c" , Baseline left parenthesis, 1 minus "t" , right parenthesis plus left parenthesis, "C" . "x" , "M" Subscript, "c" , Baseline . "y" , right parenthesis "t"Mc1−t+C.x,Mc.yt
12
表达式13: "C" left parenthesis, 1 minus "t" , right parenthesis plus left parenthesis, "C" . "x" , "M" Subscript, "c" , Baseline . "y" , right parenthesis "t"C1−t+C.x,Mc.yt
13
表达式14: 1 half left parenthesis, "C" plus left parenthesis, "C" . "x" plus 1 , "M" Subscript, "c" , Baseline . "y" , right parenthesis , right parenthesis12C+C.x+1,Mc.y
14
表达式15: 1 half left parenthesis, "M" Subscript, "c" , Baseline plus left parenthesis, "C" . "x" plus 1 , "M" Subscript, "c" , Baseline . "y" minus 1 , right parenthesis , right parenthesis12Mc+C.x+1,Mc.y−1