Geometry — Grade 9

Interactive geometry lessons by ironfern.

Chapters

• §2 Solving Triangles — Trigonometric functions, Law of Cosines, Law of Sines, triangle area formulas
• §3 Regular Polygons — Regular polygons, circumference, circle area
• §4 Cartesian Coordinates on a Plane — Distance formula, equations of lines and figures, coordinate method
• §5 Vectors — Vector concept, coordinates, addition, scalar product
• §6 Transformations of Figures — Isometries, translation, symmetry, rotation, homothety
• §7 Introduction to Solid Geometry — Lines and planes in space, prisms, pyramids, cylinders, cones, spheres