Geometry & Trigonometry

Area, volume, angles, triangles, circles and right-triangle trigonometry.

• Area & volume The reference sheet already lists the volume formulas. 12 questions · 3 worked examples · 5 figures
• Circles Every arc, sector, and central-angle question is one proportion: part-angle over 360° equals part-measure over the whole. 12 questions · 3 worked examples · 6 figures
• Coordinate geometry The coordinate plane turns geometry into algebra. 12 questions · 3 worked examples · 4 figures
• Lines & angles Two facts carry almost every item on this page. 12 questions · 3 worked examples · 6 figures
• Pythagorean theorem & applications The arithmetic of a^2 + b^2 = c^2 is not the skill. 12 questions · 3 worked examples · 4 figures
• Right triangle trigonometry Every trig item on this skill lives inside one right triangle. 12 questions · 3 worked examples · 5 figures
• Similarity & congruence Similar figures share a shape; congruent figures share a shape and a size. 12 questions · 3 worked examples · 4 figures
• Three-dimensional figures A 3D question on the Digital SAT is almost always a 2D question wearing a solid costume. 12 questions · 3 worked examples · 6 figures
• Triangles Most triangle items on the Digital SAT are a proportion in disguise. 12 questions · 3 worked examples · 8 figures
• Trigonometry beyond basic right triangles Right-triangle SOH-CAH-TOA is not enough for every trig item on the Digital SAT. 12 questions · 3 worked examples · 3 figures