In both the Trigonometry strand of the Principles course and the Measurement and Trigonometry strand of the Foundations course, students apply trigonometry and the properties of similar triangles to solve problems involving right triangles. Students in the Principles course also solve problems involving acute triangles. Students in the Foundations course begin
to study the imperial system of measurement, and apply units of measurement appropriately to problems involving the surface area and volume of three-dimensional figures.