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Given the figure at right, determine the measures of the four lettered angles. Explain how you found each angle measure and name the relationship(s) you used to do so.

Use your knowledge about supplementary angles, vertical angles, alternate interior angles, same side interior angles, and parallel lines.

2 horizontal lines, each marked with 2 arrows, with 2 rays starting at different points on the bottom line, left one going up & left, right one going up & right. At the points of intersection, angles are labeled as follows: top left: exterior left, 54 degrees, interior right, c. top right, interior left, b. bottom left, interior right, d, bottom right, interior left, a, interior right, 67 degrees.