In Figure 1.1, what is the measure of e? (Explain)

Answer:
∠ e = 135°
Step-by-step explanation:
∠ f and 45° are corresponding angles and are congruent , so
∠ f = 45°
∠ e and ∠ f are adjacent angles and sum to 180°
∠ e + 45° = 180° ( subtract 45° from both sides )
∠ e = 135°