Expression 20: "m" Subscript, 2 , Baseline equals tangent left parenthesis, 180 minus StartFraction, "B" Subscript, "D" "C" , Baseline Over 2 , EndFraction , right parenthesism2=tan180−BDC2
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Expression 21: "y" equals "m" Subscript, 1 , Baseline left parenthesis, "x" minus "C" Subscript, 1 , Baseline , right parenthesis plus "C" Subscript, 2 , Baseliney=m1x−C1+C2
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Expression 22: "y" equals "m" Subscript, 2 , Baseline left parenthesis, "x" minus "D" Subscript, 1 , Baseline , right parenthesis plus "D" Subscript, 2 , Baseliney=m2x−D1+D2
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Expression 23: "m" Subscript, 1 , Baseline left parenthesis, "x" minus "C" Subscript, 1 , Baseline , right parenthesis plus "C" Subscript, 2 , Baseline equals "m" Subscript, 2 , Baseline left parenthesis, "x" minus "D" Subscript, 1 , Baseline , right parenthesis plus "D" Subscript, 2 , Baselinem1x−C1+C2=m2x−D1+D2