Geometry Proofs Task Cards

Math Giraffe
Grade Levels
9th - 11th
Formats Included
  • Zip
25 plus answer keys & instructions
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Math Giraffe


Proof Writing in High School Geometry (Two-Column Proofs):

This versatile set of 12 geometry proof problems can be used in many ways.

You get the set of 12 proof problems in two formats : one with a two-column table set up for recording, and one without. A student recording sheet is included as well. Answer keys are included, but there may be other possible approaches to some proofs.

Option 1: Print one set of task cards and laminate them. Print a “recording sheet” for each student. They can work in small teams or rotate through stations to complete tasks.

Option 2: Print multiple cards per page to create worksheets for student practice.

Option 3: One proof at a time can be projected for full-class practice.

Option 4: Use an assortment of proofs to create an assessment.

Concepts Used in Justifications for Proofs in this set (prior knowledge required):


Supplementary angles

Linear pairs

Vertical angles

Reflexive property

Symmetric property

Transitive property

Angle Addition Postulate

Segment Addition Postulate

Corresponding angles Postulate

Alternate interior angles Theorem

Alternate exterior angles Theorem

Same-side interior angles Theorem

Same-side exterior angles Theorem

“Right angles are congruent”

“Base angles of Isosceles triangles are congruent”







(+ converses of any of the above where applicable)

See preview for views of the two formats of task cards and some samples. The zip file contains PDF files.

Check out a full unit - teaching proofs from the very beginning:

Proofs: Full Unit

For more task cards, try:

Algebra In Geometry Task Cards: Finding Missing Angle Measures

Task Cards: Slopes of Parallel and Perpendicular Lines

For more great high school Geometry resources, try:

Lesson Pack: Transversals

Quadrilaterals Proofs

Total Pages
25 plus answer keys & instructions
Answer Key
Teaching Duration
2 days
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to see state-specific standards (only available in the US).
Prove theorems about parallelograms.
Prove theorems about triangles.
Prove theorems about lines and angles.


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