Trigonometry Related Pages: 17 "Types of Angles"
College Algebra and Trigonometry Related Pages: 425 figure 5
Precalculus Related Pages: 343 figure 5

This activity allows you to practice angle vocabulary. In the diagram, line l is parallel to line m. Also, line r is parallel to line s. Each of the angles formed by the intersection of these 2 sets of parallel lines can be classified as acute, obtuse, or right.

• acute angle - an angle whose measure is less than 90 degrees
• obtuse angle - an angle whose measure is greater than 90 degrees
• right angle - an angle whose measure is 90 degrees

• transversal - a line or ray that intersects 2 or more lines or rays
• adjacent angles - two angles that share a ray, thereby being directly next to each other
• alternate exterior angles - angles located outside a set of parallel lines and on opposite sides of the transversal.
• alternate interior angles - angles located inside a set of parallel lines and on opposite sides of the transversal.
• vertical angles - angles that share only one point. They are on opposite sides of the transversal.

*Note: This portion of the activity is supplementary to the text.