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Geometric Proof Teacher Resources
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Students examine their prior knowledge of algebra to explore geometric proof. In this proving supplementary and complementary lesson, students prove a solution to an equation using algebraic properties. Students then write their own statements to prove their logic. Students then complete a series of geometric proof problems.
Tenth graders investigate angles and arcs in circles. In this geometry lesson, 10th graders explore the relationship between the intersecting chords of a circle and the intercepted arcs. The lesson makes use of a dynamic geometry utility and includes several problems that apply the theorem and a 2-column formal proof of the theorem.
Show your school spirit while proving theorems about triangles! Your student geometers are charged with coming up with a new design for the school pennant, following specific guidelines. Along the way, they need to prove the theorem that base angles of an isosceles triangle are congruent. Not only is this a learning activity, if you allow time to decorate the pennants, you'll end up with great room or hall decorations.