Vertical Angles Proof Samples

This Vertical Angles Proof Samples activity & project also includes:

This visual, manipulative-based format for teaching geometric proofs nicely scafolds learners' development of mathematical reasoning and proof skills. This sample represents a proof of the congruence of vertical angles in four formats; visually using manipulatives, paragraph, two column, and proof blocks. 

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CCSS: Designed
Classroom Considerations
  • 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
  • Uses manipulatives to approach geometric proofs visually
  • Visually helps learners organize their thinking around the concept of proof and it leads nicely into two-column proofs
  • More manipulatives, called proof blocks, are located at
  • This proof sample includes very little student practice, but there is a link at the bottom of the page that takes you to the Proofblocks website which has more resources
Common Core