Answer:
x = 115° , y = 140° , z = 40°
Explanation:
40° , x and 25° lie on a straight line and sum to 180° , that is
x + 40° + 25° = 180°
x + 65° = 180° ( subtract 65° from both sides )
x = 115°
z and 40° are vertically opposite angles and are congruent , then
z = 40°
y and z lie on a straight line and sum to 180° , that is
y + 40° = 180° ( subtract 40° from both sides )
y = 140°