In ∆SKL we know that m∠1 + m∠l<180 by the corollary of the Exterior Angle Inequality me...

In ∆SKL we know that m∠1 + m∠l<180 by the corollary of the Exterior Angle Inequality mentioned in this section. Show that if the rays at K and L that "double" ∠1 and ∠2 meet at W(i.e., rays and bisect ∠WKL and ∠WLK), then m∠l + m∠2<90.