Quizlet ACT / SAT Geometry formulas

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  1. 180 degrees: All the interior angles of a triangle
  2. 360 degrees: All the interior angles of a quadrilateral
  3. A = (base 1 + base 2)/2 x h: Area of a trapezoid
  4. A = 1/2 b x h: Area of a triangle
  5. A = b x h: Area of a parallelogram
  6. A = l x w: Area of a rectangle
  7. A = pi x radius squared: Area of a circle
  8. A = side squared: Area of a square
  9. Add all sides: Perimeter of any shape
  10. C = pi x diameter: Circumference of a circle