## vertical angles

### A pair of opposite congruent angles formed by intersecting lines

Vertical angles are a pair of non-adjacent angles formed by the intersection of two lines. These angles are opposite each other and share a common vertex, but are not adjacent (meaning they don’t share a side).

Vertical angles are always congruent, which means they have the same measure. This is a geometric property that holds true regardless of the size or shape of the intersecting lines. The measure of one vertical angle is equal to the measure of the other.

To visualize vertical angles, imagine two intersecting lines, forming an “X” shape. The angles on opposite sides of the X are vertical angles. For example, if one angle measures 60 degrees, the other vertical angle will also measure 60 degrees.

Understanding the concept of vertical angles is important in geometry, as it helps in proving theorems and solving problems related to angle relationships. One common application is in proving that two lines are parallel, using the alternate interior angle theorem or corresponding angles theorem, which rely on vertical angles.

In summary, vertical angles are a pair of opposite angles formed by the intersection of two lines, always having equal measures. They are an important concept in geometry and help in solving problems involving angles and proving theorems.

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