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# Geometry Angles Study Guide: GED Math (page 2)

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### Classifying Angles

Angles are classified by their measures. They can be acute (less than 90 degrees), right (90 degrees), obtuse (more than 90 degrees), or straight (180 degrees). Here are some examples these different kinds of angles.

### Relationships between Lines and Angles

Lines have different relationships with one another depending on whether and how they intersect to form angles. Here are some examples of different relationships lines can have with one another.

When a transversal intersects two parallel lines, eight angles form. These angles have different names, depending on their relationships both to each other and to the parallel lines. For example, some pairs of angles formed by a transversal and two parallel lines are said to be congruent. Congruent angles are equal in measure. Some pairs of angles formed by a transversal and two parallel lines are said to be supplementary. The measures of supplementary angles add up to 180°.

Practice problems for these concepts can be found at:

Geometry Practice Problems: GED Math

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