- Ray: A part of a line that has one endpoint and extends infinitely in one direction.
- Angle: A figure formed by two rays sharing a common endpoint.
- Vertex: The common endpoint where two rays meet to form an angle.
- Acute Angle: An angle measuring less than 90 degrees.
- Right Angle: An angle measuring exactly 90 degrees.
- Obtuse Angle: An angle measuring more than 90 degrees but less than 180 degrees.
- Straight Angle: An angle measuring exactly 180 degrees, forming a straight line.
- Complementary: Two angles whose measures add up to 90 degrees.
- Supplementary: Two angles whose measures add up to 180 degrees.
- Congruent: Angles (or figures) that have the same measure or size.
Parent Tip: Review the logic above to help your child master the concept of angles vocabulary worksheet.
