dolphin
Get Started

SAT Math skill page

SAT Geometry Practice

Review the SAT geometry moves that turn diagrams into equations and formulas into points.

Practice geometry in DolphinPractice questions
12-18 min practice time3 questions on pageGeometry and Trigonometry
Practice time12-18 min
Question bank3 questions
Best forGeometry and Trigonometry

What this tests

What to know for this SAT skill

Dolphin question bank

Practice your skill

Question 1 of 3Easy
A triangle has angle measures 50 degrees, 60 degrees, and x degrees. What is x?
  1. 60
  2. 70
  3. 80
  4. 90
Show answer and solution
Correct answerB. 70

Solution walkthrough

  1. Triangle angles add to 180 degrees.
  2. So x = 180 - 50 - 60 = 70.
Question 2 of 3Medium
A rectangle has length 10 and perimeter 34. What is its width?
  1. 5
  2. 7
  3. 12
  4. 14
Show answer and solution
Correct answerB. 7

Solution walkthrough

  1. Perimeter is 2(length + width).
  2. So 34 = 2(10 + w), which gives 17 = 10 + w and w = 7.
Question 3 of 3Hard
A circle has circumference 18pi. What is its area?
  1. 18pi
  2. 36pi
  3. 81pi
  4. 324pi
Show answer and solution
Correct answerC. 81pi

Solution walkthrough

  1. Circumference is 2pi r.
  2. If 2pi r = 18pi, then r = 9.
  3. The area is pi = 81pi.

Avoid these traps

Common mistakes on this skill

Using the wrong formula

Circle circumference and area both use pi, but circumference is 2pi r and area is pi r squared.

Forgetting angle totals

Triangles add to 180 degrees, straight lines add to 180 degrees, and full circles add to 360 degrees.

Mixing up radius and diameter

The diameter is twice the radius. Check which one the question gives before using a circle formula.

Study plan

How to practice this skill in Dolphin

  1. Memorize the high-frequency SAT geometry formulas.
  2. Label diagrams with every given and inferred value.
  3. Write a short equation before trying answer choices.
  4. Check units: length, square units, and cubic units are not interchangeable.
Practice geometry in Dolphin

Related practice

Build the surrounding skills

SAT Right Triangles PracticeSAT Ratios and Proportions PracticeSAT Quadratic Equations PracticeSAT Math skill hub

Skill cluster

Keep practicing SAT Math

SAT Math skill hubSAT Linear Equations PracticeSAT Systems of Equations PracticeSAT Linear Functions PracticeSAT Quadratic Equations PracticeSAT Percentages PracticeSAT Ratios and Proportions PracticeSAT Probability PracticeSAT Right Triangles PracticeSAT Data Analysis PracticeSAT Circle Equations PracticeSAT Exponential Functions PracticeSAT Inequalities PracticeSAT Equivalent Expressions PracticeSAT Systems of Inequalities PracticeSAT Absolute Value Equations PracticeSAT Function Notation PracticeSAT Polynomials PracticeSAT Scatterplots PracticeSAT Mean and Median PracticeSAT Unit Conversions PracticeSAT Exponent Rules PracticeSAT Quadratic Word Problems PracticeSAT Systems Word Problems PracticeSAT Slope-Intercept Form PracticeSAT Area and Volume PracticeSAT Percent Change PracticeSAT Trigonometry PracticeSAT Rational Equations PracticeSAT Radical Equations PracticeSAT Conditional Probability PracticeSAT Sampling and Margin of Error PracticeSAT Statistical Claims PracticeSAT Reading and Writing Practice PagesDolphin SAT study guidesSAT score guides by college

FAQ

Questions about SAT Geometry Practice

How much geometry is on SAT Math?

Geometry is a smaller but important part of SAT Math. It often appears through triangles, circles, angles, and area.

Are formulas provided on the SAT?

Some formulas are provided, but you still need to know when and how to use them quickly.

What is the best way to study SAT geometry?

Practice recognizing the formula or relationship a diagram is asking for before doing calculations.