Geometry and Trigonometry The smallest domain and the most formula-driven — and the reference sheet gives you most of the formulas. Area and volume, angle and triangle relationships, right-triangle trigonometry, and circles in both their geometric and coordinate forms.
The course — 4 units, in order
01 Area and Volume Formulas Choosing the right formula off the reference sheet, telling a radius from a diameter and a height from a slant, composite shapes — and the scaling rule that multiplies area by k squared and volume by k cubed. Start 02 Lines, Angles, and Triangles Two angle sizes across a transversal, the triangle angle sum and the exterior-angle shortcut, isosceles triangles and which angles are the equal pair, and similarity — where lengths scale by k and areas by k squared. Start 03 Right Triangles and Trigonometry Pythagoras and the triples worth recognising, the two special triangles from the reference sheet, the three trigonometric ratios and how to pick one — and the complementary identity the test asks about directly. Start 04 Circles The equation of a circle and the completing-the-square work to reach it, arcs and sectors as fractions of the whole, inscribed angles at half the central angle, and the radians that make arc length a single multiplication. Start