angle 1 and 2
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Corresponding angles are equal and are formed when a transversal line cuts through parallel lines
Yes. Write an upper case (capital) letter F (in italics if you like). The angles underneath the horizontal lines of the F will form a single pair of corresponding angles.
45 degrees
any pair of angles that have the same relative position at each intersection where a straight line crosses two others
Two triangles are similar if:two pairs of corresponding angles are equal, orone pair of angles is equal, and the ratios of the lengths of sides adjacent to the angles are the same, orthe lengths of the three pair of corresponding sides are in the same ratio.For the first point, if two angles of one triangle are equal to two of the other, then the third angles = 180 - sum of the two, must be equal.