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from Teachers Pay Teachers

### Introductory Geometry Proofs Cut and Paste Activity

In this activity students will cut strips of paper and assemble them into two-column proofs. The first two proofs are algebraic proofs, the third proof uses the segment addition postulate, and the fourth proof uses the definition of congruence. A "Hints Sheet" is included for struggling students.

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from Teachers Pay Teachers

### Postulates, Corollaries, & Theorems List ~ High School Geometry

This 21 page High School Geometry Theorems Postulates & Corollaries List would be perfect to help my math students understand all the difficult Geometry concepts! There are over 120 different Theorems in here! Its so thorough. I love how the Theorems all have a diagram and explanation next to them to help put them in "student words". This would be especially helpful when we learn proofs and all those pesky circle theorems. Love Love Love!

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Unit 2: Reasoning & Proofs ~ Teaching Two-Column Proofs in High School Geometry

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A Better Approach to Introducing Two-Column Proof Writing in Geometry

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Activities for congruent triangle proofs in geometry

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from Teachers Pay Teachers

Algebraic Proofs Task Cards - use as an intro to proofs in geometry

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Teaching is Forever: The Proof is in the Pudding...or the Proof Practice Book!

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Before introducing Geometry-based two-column proofs, have students work with Algebra proofs that incorporate the TRANSITIVE PROPERTY and SUBSTITUTION. Adding this was the best change I could make. (samples included in blog post) www.mathgiraffe.com

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from Teachers Pay Teachers

### Angle Relationships Proof Activity

My High School Geometry students LOVED this proving angle relationships proof activity! It really helped their understanding of proofs. Once we were done we glued them in with our notes in our interactive notebook. I will definitely be doing this again next year. G.6A Verify theorems about the intersection of lines, including vertical angles and angles formed by parallel lines cut by a transversal and apply these relationships to solve problems.

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