Mathematics SAT-84: Mastering Desmos II — Sliders for Unknown Constants Add a slider in Desmos to test unknown constants and instantly find the value that fits a condition.
Mathematics SAT-83: Mastering Desmos I — Graphing and Intersections Use the Desmos calculator to graph equations and read solutions as x-intercepts and intersection points.
Mathematics SAT-82: Backsolving (Working from the Options) Plug the answer choices back into the problem to find which one works — no algebra needed.
Mathematics SAT-81: The "Plugging In Numbers" Tactic Turn abstract variable problems into easy arithmetic by choosing your own simple numbers.
Mathematics SAT-80: Completing the Square to Find a Circle's Center and Radius Turn an expanded circle equation into standard form by completing the square for x and for y.
Mathematics SAT-79: Circle Equations in the Coordinate Plane Read the center and radius straight from the standard circle equation (x − h)² + (y − k)² = r².
Mathematics SAT-78: Area of a Sector of a Circle Find the area of a 'pizza slice' sector as a fraction of the whole circle's area.
Mathematics SAT-77: Radians vs. Degrees and Arc Length Convert between radians and degrees and compute arc length as a fraction of the circle's circumference.
Mathematics SAT-76: Trigonometric Identities — sin(x) = cos(90° − x) Use the cofunction identity sin(x) = cos(90° − x) to connect the sine and cosine of complementary angles.
Mathematics SAT-75: Right Triangle Trigonometry — Sine, Cosine, Tangent Use SOH-CAH-TOA to relate the sides and angles of a right triangle and solve for unknowns.
Mathematics SAT-74: Congruent Triangles and Area/Perimeter Scaling Tell congruent from similar figures, and scale perimeter by k and area by k² when sizes change.
Mathematics SAT-73: Triangle Inequality and Similarity (AA, SAS) Use the triangle inequality to test side lengths and AA/SAS to prove triangles are similar.
