CPM Homework Help : INT3 Problem 4-26

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.

Hint:

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

Answer:

$a=113^\circ$
$c=54^\circ$
$b=67^\circ$
$d=126^\circ$

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.