Question

Degree measures of three angles of a triangle are X Y and Z if Z = X + Y upon 2 then find the value of Z

Answer 1

x+y+z=180

dividing by 2

(x+y+z=180)/2

(x+y)/2+z/2=90

z+z/2=90

3z/2=90

z=180/3

z/60