The purpose of this resource is to help math teachers unpack, understand, and implement the current math content and practice standards. This resource describes the progressions of learning within each course and provides content support, which includes broad ideas about effective instruction as well as practical instructional strategies. Math teachers, coaches, and leaders are encouraged to use these materials collaboratively to support ongoing instruction and the growth of individual teaching practice. The content is organized by the following domains in Geometry, including: (1) Standards for Mathematical Practice; (2) Geometry: Logic and Proofs; (3) Geometry: Points, Lines, and Angles; (4) Geometry: Transformations; (5) Geometry: Triangles; (6) Geometry: Quadrilaterals and Other Polygons; (7) Geometry: Circles; and (8) Geometry: Three-Dimensional Figures.