Y = x + 3
3 x + 2 = y + 1
3 x + 2 = x + 3 + 1Â
2 x = 2
x = 1, Â y = x + 3 = 4
We have: Â 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°
C ) 37°Â
Â