SAT Math Domain · ~15% of Math

SAT Geometry & Trigonometry

Area, volume, triangles, and the unit circle.

Geometry and Trigonometry is the smallest Math domain but the one most students neglect. It covers coordinate geometry, triangles, circles, volume, and basic trig (sin, cos, tan). The reference sheet gives you most formulas — but not the Unit Circle.

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What this domain covers

  • Coordinate geometry (slope, distance, midpoint)
  • Triangles, including similar and right triangles
  • Circles (arcs, sectors, equations)
  • Volume of prisms, cylinders, cones, pyramids, spheres
  • Basic trigonometry (SOH-CAH-TOA) and the unit circle

Strategy that actually works

  1. 1Memorize the reference sheet — then train yourself to derive every formula without it.
  2. 2For right-triangle problems, always check for 3-4-5, 5-12-13, or 30-60-90 / 45-45-90 patterns first.
  3. 3Circle equation: (x − h)² + (y − k)² = r². If it is expanded, complete the square.
  4. 4The complementary-angle identity sin(θ) = cos(90° − θ) appears on nearly every test.

Frequently asked

Do I need to memorize the unit circle for the SAT?+

You do not need the full unit circle, but you must know sin, cos, and tan for 0°, 30°, 45°, 60°, and 90° — these power almost every trig question.

Is the reference sheet enough?+

For simple geometry yes, but not for trig. The reference sheet omits all trig identities, so memorize SOH-CAH-TOA and the basic angles.

How many Geometry questions will I see?+

Roughly 5 to 7 out of 44 Math questions. Small domain, but worth ~80 points on your final section score.

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