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- Grade Range
- 10th
- Rating
Students work together to write a geometric proof. Full Review »
- Grade Range
- 9th - 12th
- Rating
Students practice writing formal two column geometric proofs involving congruent triangles and congruent corresponding parts. Full Review »
- Grade Range
- 9th - 12th
- Rating
Students select a geometric figure and find an example of the figure in their surroundings. They photograph the figure and write a proof to accompany it. They match photos to proofs. Full Review »
- Grade Range
- 10th - 12th
- Rating
Students formalize the idea of a proof. They understand and use the idea of truth. They discuss the question "What does it mean to prove that something is true?" They write geometric proofs, including proofs by contradiction. Full Review »
- Grade Range
- 10th - 12th
- Rating
Students explore different classifications of triangles. Students define geometric terms associated with triangles. Following a step-by-step process, introduced and completed in class, they solve a proof. Full Review »
- Grade Range
- 10th - 12th
- Rating
Students review the postulates of algebra that have a significant relationship to geometry. Students complete proofs through the use of geometric properties and principles. This lesson is a continuation of a previous lesson on proofs. Full Review »
- Grade Range
- 10th - 11th
- Rating
Students solve a given proof working with a partner. They complete four proofs. They explain the proof to the teacher and other groups. They practice constructing congruent triangles and proofs of congruence. Full Review »
- Grade Range
- 10th - 12th
- Rating
Students are introduced to the concept that proofs are related to the construction of parallel lines. As a whole class, if-then statements are reviewed. Students create an inf-then proof for parallel lines. Full Review »
- Grade Range
- 9th - 11th
- Rating
Students explore basic proofs. They discuss and write the rules for the game "Uno," discuss postulates and play the game of Uno to explore direct proofs. Using Uno rules as postulates, students create a two column proof. Students write proofs and exchange them with others to solve them. Full Review »
- Grade Range
- 9th - 12th
- Rating
Students engage in a lesson that is about the classification of triangles and the mathematical proofs involved in working with them. They work on a variety of problems that are created by the teacher with the focus upon the importance of classifying the triangles. Full Review »