Question:
Solution:
According to the diagram, we get the following equations:
Equation 1:
Equation 2:
the angle 3 is 112 degrees, so replacing this value into the previous equation, we get:
solving for angle 4, we get:
now, note that
Equation 3:
but the angle 4 is 68 degrees, so replacing this into the above equation, we get:
solving for angle 1, we get :
Finally, from equation 1, we get:
then,
we can conclude that the correct answer is: