Inquiry maths is a model of teaching that encourages students to regulate their own activity while exploring a mathematical statement (called a prompt). The website has resources for secondary school teachers.
Euclid of Alexandria revolutionized the way that mathematics is written, presented or thought about, and introduced the concept of mathematical proofs. Discover what it takes to move from a loose theory or idea to a universally convincing proof.
Segment and Angle Proofs Task Cards - I love using task cards to help high school students practice geometry proofs. I can do so many different activities with them and I can spend time helping struggling students.
This quadrilaterals product idea is my favorite for high school geometry! My students loved the social media aspect and it was so much better than a worksheet. It really helped them with classifying and remembering the properties of quadrilaterals.