Y = x + 3 3 x + 2 = y + 1 3 x + 2 = x + 3 + 1 2 x = 2 x = 1, y = x + 3 = 4 We have: 3 x + 2 = y + 1 and: y = x + 3. It means that we have 4 equal triangles ( O is the centre ): ΔTOS, ΔSOR, ΔROQ, ΔQOT. ∠ 1 = 53° ∠ 2 = (180° - 2 · 53°) : 2 = 37° Answer: C ) 37°