Say angle 1 is 40 which means that if angle 3 is congruent then angle 3 is also 40 by definition of vertical angles. That would make angle 2 equal to 140 by definition of a linear pair and so angle 4 is congruent by vertical angles.
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All of them. If its truly intersecting lines, they have to form right angles. All of them. If its truly intersecting lines, they have to form right angles.
perpendicular lines
The only difference between perpendicular lines and intersecting lines is that perpendicular lines create a right angle at the point of intersection.
perpendicular lines
bicylinder