Find angle X in each figure

1) 40 because it is an isosceles triangle
2) 90 because we can see that they are perpendicular lines.
3) 50 because it is an isosceles
4) 40 Because it is an isosceles and angles in a triangle add up to 180
5) 45 because we know that one of the angles is 90 and this is an isosceles triangle
6) 70 because this is once again an isosceles triangle and angles in a triangle add up to 180 so you can easily make an expression like 180 = 2x + 40