Chapter 2 - Section 2.4 - The Angles of a Triangle - Exercises - Page 93: 18

m$\angle$A=108^{\circ}

Work Step by Step

By the same proof as the previous problem, angles 1 and 3 are congruent. m$\angle$1=m$\angle$3=36$^{\circ}$ m$\angle$A+m$\angle$1+m$\angle$3=180 m$\angle$A+36+36=180 m$\angle$A=108$^{\circ}$

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