Geometry Formulas for SAT and ACT Math flashcards

How this deck was checked

On 2026-10-19, every card was compared with a primary source and with a second source from a different publisher. The comparison was done automatically, not by a teacher, so a card can still be wrong. Flash Feed is not affiliated with any source named here.

Sources

• Primary source A TAAP Geometry End-of-Course Examinations Released Item Booklet, 2013-2014 (reference sheet p. 46; scoring guide p. 23) (Arkansas Department of Education, dese.ade.arkansas.gov)
• Primary source Keystone Exams: Geometry Assessment Anchors and Eligible Content (formula sheet pp. 4-5; glossary) (Pennsylvania Department of Education, pa.gov)
• Primary source PSSA Mathematics Glossary to the Assessment Anchors and Eligible Content (2014) (Pennsylvania Department of Education, pa.gov)
• Primary source A TAAP Geometry Mid-Year End-of-Course Examination Released Item Booklet, January 2007 (Arkansas Department of Education, dese.ade.arkansas.gov)
• Second source OpenStax Prealgebra 2e 9.3 Angles, triangles and the Pythagorean theorem (OpenStax (Rice University), openstax.org)
• Second source Wikipedia: Quadrilateral (Wikimedia Foundation, en.wikipedia.org)
• Second source K12 LibreTexts Geometry 5.27 Interior Angles in Convex Polygons (K12 LibreTexts (CK-12 content), k12.libretexts.org)
• Second source K12 LibreTexts Geometry 4.02 Classify Triangles by Angle Measurement (K12 LibreTexts (CK-12 content), k12.libretexts.org)
• Second source K12 LibreTexts Geometry 1.14 Complementary Angles (K12 LibreTexts (CK-12 content), k12.libretexts.org)
• Second source K12 LibreTexts Geometry 1.15 Supplementary Angles (K12 LibreTexts (CK-12 content), k12.libretexts.org)
• Second source K12 LibreTexts Geometry 1.17 Vertical Angles (K12 LibreTexts (CK-12 content), k12.libretexts.org)
• Second source K12 LibreTexts Geometry 1.10 Classifying Angles (K12 LibreTexts (CK-12 content), k12.libretexts.org)
• Second source K12 LibreTexts Geometry 6.09 Arcs in Circles (K12 LibreTexts (CK-12 content), k12.libretexts.org)
• Second source K12 LibreTexts Geometry 6.10 Area of Sectors and Segments (K12 LibreTexts (CK-12 content), k12.libretexts.org)
• Second source OpenStax Prealgebra 2e 9.4 Rectangles, triangles and trapezoids (OpenStax (Rice University), openstax.org)
• Second source K12 LibreTexts Geometry 6.11 Arc Length (K12 LibreTexts (CK-12 content), k12.libretexts.org)
• Second source K12 LibreTexts Geometry 6.14 Inscribed Angles in Circles (K12 LibreTexts (CK-12 content), k12.libretexts.org)
• Second source K12 LibreTexts Geometry 6.21 Circles in the Coordinate Plane (K12 LibreTexts (CK-12 content), k12.libretexts.org)
• Second source Wolfram MathWorld: Hypotenuse (Wolfram Research, mathworld.wolfram.com)
• Second source OpenStax Algebra and Trigonometry 2e 7.2 Right Triangle Trigonometry (OpenStax (Rice University), openstax.org)
• Second source Wikipedia: Cone (Wikimedia Foundation, en.wikipedia.org)
• Second source Wikipedia: Pyramid (geometry) (Wikimedia Foundation, en.wikipedia.org)
• Second source OpenStax Prealgebra 2e 9.5 Circles (OpenStax (Rice University), openstax.org)
• Second source OpenStax Prealgebra 2e 9.6 Volume and surface area (OpenStax (Rice University), openstax.org)
• Second source STAAR Grade 4 Mathematics Reference Materials (Texas Education Agency, tea.texas.gov)
• Second source K12 LibreTexts Geometry 5.10 Area of a Parallelogram (K12 LibreTexts (CK-12 content), k12.libretexts.org)
• Second source K12 LibreTexts Geometry 5.14 Area and Perimeter of Trapezoids (K12 LibreTexts (CK-12 content), k12.libretexts.org)
• Second source Wikipedia: Parallelogram (Wikimedia Foundation, en.wikipedia.org)
• Second source K12 LibreTexts Geometry 4.17 Triangle Angle Sum Theorem (K12 LibreTexts (CK-12 content), k12.libretexts.org)

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