Given:
Two runways are parallel and a taxi way crosses both runways.

Required:
We need to find the sum of the measures of D1 and D4.
Step-by-step explanation:
We know that D8 and D4 are corresponding angles.
Recall that corresponding angles are congruent.

Substitute D8=127 in the equation.

We know that D8 and D1 are alternate exterior angles.
Recall that alternate exterior angles are congruent.

Substitute D8=127 in the equation.

Add D1 and D4.


Final answer:
