Exterior Angles
When two parallel lines are intersected by a transversal, two groups of four angles of equal measurement are created. The four smaller angles have equal measurements just as the four larger angles.
An example of a transversal line, t, intersecting two parallel lines a and b is depicted below:
In the above
figure,θ represents the smaller angle while β
represents the larger angle. The four angles residing outside the
two parallel lines are referred to as exterior angles (reference figure
below):
In the figure presented above, the two
angles represented by θ are referred to as alternate exterior
angles. Similarly, the two angles depicted by β
represent alternate exterior angles.
Related Topics: