In a ΔABC, the sides AB and AC are extended to P and Q, respectively, the bisects of ∠PBC and ∠QCB intersect at a point R, If ∠R = 70°, then the measure of ∠A is?

20° 40° 50° 60°

40°

∠R = 90° - \(\frac{∠A}{2}\)  70° = 90° - \(\frac{∠A}{2}\)  ∠A = 40°