Answer:
∠ 1 = 125°
Step-by-step explanation:
If the staircase and rail were parallel , then
∠ 1 and 55° are same- side interior angles and sum to 180° , that is
∠ 1 + 55° = 180°( subtract 55° from both sides )
∠ 1 = 125°
For the rail to be parallel to the bottom of the staircase then ∠ 1 = 125°
