Right Triangles and Trigonometry on the Digital SAT: the Desmos Method
Almost every question here is one line of arithmetic. Work out which line it is, type the whole line into Desmos in one go, and read the number Desmos prints. If the answer is a fraction, leave it as a fraction.
Geometry & Trigonometry·65 practice problems in DesPrep
The Right Triangles and Trigonometry lesson is part of DesPrep
It is one of the 17 full lessons inside the subscription — 7 sections that take right triangles and trigonometry from first principles to the fastest Desmos route, with a worked example on every one:
- One line, and the trap inside it
- The same theorem, run backwards
- Perimeter: find the third side without writing it down
- The three ratios, and why you must not round them
- When the sides are named by letters instead of by position
- A ratio does not care how big the triangle is
- Degrees, radians, and the one question that becomes a graph
Then 65 practice problems on this skill alone, solved inside a live Desmos calculator with step feedback and an expert replay on every one.
More Geometry & Trigonometry guides
- Area and VolumeArea and volume formulas evaluated in Desmos, including the maximum-area problems that are really parabolas in disguise.
- Lines, Angles and TrianglesAngle relationships and triangle facts, with Desmos handling the arithmetic.
- CirclesCenter, radius and extreme points of a circle — graphed as a semicircle when the answer is a point you can click.