Geometry with Statistics (GS) is the first required course in high school mathematics. It builds on the students’ experience in the middle grades. GS is a prerequisite to Algebra 1. Students incorporate knowledge and skills from several mathematics content areas, leading to a deeper understanding of fundamental relationships within the discipline and see the applicability of mathematics to prepare more effectively for further studies in Algebra 1. Students build on and deepen prior understanding of transformations, congruence, similarity, and coordinate geometry concepts. Informal explorations of transformations provide a foundation for more formal considerations of congruence and similarity, including development of criteria for triangle congruence and similarity. An emphasis on reasoning throughout the content area promotes exploration, conjecture testing, and informal and formal justification. The course also focuses on statistics in analyzing data.