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Triangles
Area = ½ base x height
Parallelograms
Area = base x height
Trapezoids
Area = ½ (sum of bases) x height
Rhombus/Kites
Area = 1/2 x (diagonal 1 x diagonal 2)
Circles
Area = π x radius²
Polygons
Area = ½ x apothem x perimeter
Prisms
Lateral Surface Area = perimeter x height, Total Surface Area = perimeter x height + 2 x base area
Cylinders
Lateral Surface Area = 2π x radius x height, Total Surface Area = 2π x radius x height + 2π x radius²
Pyramids
Lateral Surface Area = ½ x perimeter x slant height, Total Surface Area = ½ x perimeter x slant height + base area
Cones
Lateral Surface Area = π x radius x slant height, Total Surface Area = π x radius x slant height + π x radius²
Spheres
Total Surface Area = 4π x radius², Volume = 1/2 x 3π x radius²
Volume Formulas
Cylinder:V = π x radius² x height, Prism:V = base area x height, Pyramid:V = 1/3 x base area x height, Cone:V = 1/3 x π x radius² x height, Sphere:V = 4/3 x π x radius³
Arc Length Formula
arc/360 = angle in radians/π x diameter
Sector Area Formula
arc/360 = angle in radians/π x radius²
Segment Area Formula
Sector area - Triangle area
Properties of Radii and Chords
Equal chords have equal arcs
Properties of Tangents
Tangents from a point are equal in length