# What do you notice about the measure of the exterior angle and its adjacent interior angle?

**Question: What do you notice about the measure of the exterior angle and its adjacent interior angle?**

The measure of an exterior angle and its adjacent interior angle in a polygon always add up to 180 degrees. This is because they form a linear pair, which are supplementary angles.

A linear pair is a pair of adjacent angles formed when two lines intersect. Here are some key points about linear pairs:

**Adjacent Angles**: The two angles share a common vertex and a common side.**Supplementary Angles**: The measures of the two angles add up to 180 degrees.**Straight Line**: The non-common sides of the angles form a straight line.

For example, if two angles form a linear pair and one angle measures 70 degrees, the other angle will measure 110 degrees because (70^\circ + 110^\circ = 180^\circ).

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