Look at this diagram:

Answer:
∠ GHE = 40°
Step-by-step explanation:
∠ IHE and ∠ GHE are adjacent angles and are supplementary, then
∠ GHE + ∠ IHE = 180°
∠ GHE + 140° = 180° ( subtract 140° from both sides )
∠ GHE = 40°