Right Angle An angle of exactly 90 degrees

Acute Angle An angle less than 90 degrees

Acute Angle An angle less than 90 degrees

Obtuse Angle An angle greater than9 degrees

Straight Angle An angle of 180 degrees

**Resources for angles**

Measuring and classifying angles

Includes a helpful video on measuring angles and lots of pictures.

Angle Worksheets

A great resource for many free worksheets covering angles.

Ray A portion of a line with a beginning point and then travels forever in the opposite direction.

Ray Resource

Helpful manipulative in order to help you visualize a ray.

**Complementary and Supplementary Angles**

**Resources Complementary and Supplementary Angles**

**Math is Fun-Complementary Angles**

**Great pictures and manipulatives to help understand these types of angles.**