Expression 18: "m" Subscript, 1 , Baseline equals tangent left parenthesis, 180 plus 2 left parenthesis, 90 minus StartFraction, "B" Subscript, "O" "C" , Baseline Over 2 , EndFraction , right parenthesis , right parenthesism1=tan180+290−BOC2
equals=
3.4 2 8 5 7 1 4 2 8 5 73.42857142857
18
Expression 19: "y" equals "m" Subscript, 1 , Baseline left parenthesis, "x" minus "B" Subscript, 1 , Baseline , right parenthesisy=m1x−B1