from the little marks on the sides, we can tell that the top triangle is isosceles, so the the two congruent angles of the top triangle are 180-150=30 each,
∠1=180-the sum of the bottom two angles, so ∠1=180-30-30=120
the bottom triangle is also an isosceles triangle, the two congruent angles are 180-120=60 each
∠2=180-60-60=60
