left parenthesis, "S" Subscript, 1 , Baseline , "S" Subscript, 1 , Baseline , right parenthesisS1,S1
left parenthesis, "x" Subscript, 1 , Baseline , "y" Subscript, 1 , Baseline , right parenthesisx1,y1
left parenthesis, "x" Subscript, 2 , Baseline , "y" Subscript, 2 , Baseline , right parenthesisx2,y2
left parenthesis, "x" Subscript, 3 , Baseline , "y" Subscript, 3 , Baseline , right parenthesisx3,y3
StartFraction, left parenthesis, "x" minus "S" Subscript, 1 , Baseline , right parenthesis squared plus left parenthesis, "y" minus "S" Subscript, 2 , Baseline , right parenthesis squared Over "R" squared , EndFraction equals 1x−S12+y−S22R2=1
left parenthesis, "S" Subscript, 1 , Baseline plus "R" cos "t" , "S" Subscript, 2 , Baseline plus "R" sin "t" , right parenthesisS1+Rcost,S2+Rsint