Area and Volume on the Digital SAT: the Desmos Method
Every one of these questions is a formula with the numbers already handed to you. The math is not the hard part. Getting the whole formula onto one Desmos line without losing a half, an exponent or a step is the hard part, and once it is on there you just read the number Desmos prints.
Geometry & Trigonometry·65 practice problems in DesPrep
The Area and Volume lesson is part of DesPrep
It is one of the 17 full lessons inside the subscription — 7 sections that take area and volume from first principles to the fastest Desmos route, with a worked example on every one:
- One line, one number, nothing written down in between
- The half on a triangle is the most-dropped thing on the test
- The right-arrow key is most of this skill
- When they give you the area and want a side back
- A perimeter is not a length, and the slash will bite you here
- Scale a side and the area moves twice
- Leftover space is one solid minus another
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
- 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.
- Right Triangles and TrigonometryPythagorean triples and the three ratios, kept exact as fractions.