Step-by-step explanation:
this is unclear.
did this mean the left and the right sides are the same length (and parallel)?
it seems then they are 2 congruent triangles and the whole shape a parallelogram.
remember, the sum of all 3 angles in any triangle is always 180°.
so,
angle 1 = 180 - 70 - 60 = 50°
the congruence principle then makes angle 3 = angle 1 = 50°.
and then angle 2 must be 70°, as 70° + angle 3 = angle 1 + angle 2.
if I misunderstood, then angle 3 and then angle 2 can't be determined.
