AB and CD are two parrellel lines intersected by line EF. If the measure of angle 1 is , what is the measure of angle 2?

A student creates a challenge for his friend. He first draws a square, the adds the line for each of the 2 diagonals. Finally, he asks his friend to draw the circle that has the most intersections possible.

How many intersections will this circle have?

is a straight line. intersects at point . If measures 120 degrees, what must be the measure of ?

Two parallel lines are intersected by a transversal. If the minor angle of intersection between the first parallel line and the transversal is , what is the minor angle of intersection between the second parallel line and the transversal?

If measures , which of the following is equivalent to the measure of the supplement of ?

In the diagram, AB || CD. What is the value of a+b?

In the following diagram, lines and are parallel to each other. What is the value for ?

Two pairs of parallel lines intersect:

If A = 135o, what is 2*|B-C| = ?

Figure not drawn to scale.

In the figure above, APB forms a straight line. If the measure of angle APC is eighty-one degrees larger than the measure of angle DPB, and the measures of angles CPD and DPB are equal, then what is the measure, in degrees, of angle CPB?

Lines and are parallel. , , is a right triangle, and has a length of 10. What is the length of