Answer:
180 - 110 = 70
<DBC = 70
∠ PQR = 70°
Step-by-step explanation:
The tangent- tangent angle PQR is half the difference of the intercepted arcs.
minor arc PR = 360° - 250° = 110°
Then
∠ PQR = (250 - 110)° = × 140° = 70°