Construct a 90 Degree Angle

There is more than one way to create a 90-degree angle. Using a compass and a straightedge, the video shows two ways to construct a right angle. The ways include using perpendicular bisectors and circle theorems. To wrap up, pupils practice their constructions as well as construct other angle sizes in the practice sheets.

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CCSS: Adaptable
Additional Tags
Instructional Ideas
  • Show how to make constructions using other tools
Classroom Considerations
  • Individuals should have a compass and straightedge
  • Assumes the class understands theorems about inscribed angles in circles
  • This resource is only available on an unencrypted HTTP website. It should be fine for general use, but don’t use it to share any personally identifiable information
  • Answer key shows construction lines
  • Contains an embedded video file for teachers to download
  • None