As it is a trapezoid, at least 2 oposite sides are parallel.
1, The figure shows that the not parallel sides are equal length, thus there is symmetry. There will be 2-2 angles with same length.
The four angles add up to 360, but we can count with half of it and just 2 angles. (because of symmetry)
180-63=answer
For 2-3 you need the same idea
For 4 you need to use Pythagoras theorem. (a^2+b^2=c^2)