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Statics/Geometric Properties of Lines and Areas
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Centroids Of Common Shapes Of Areas And Lines
Triangular Area
Quarter Circular Area
Semicircular Area
Semiparabolic Area
Parabolic Area
Parabolic Spandrel
Circular Sector
Quarter Circular Arc
Semi Circular Arc
Arc Of Circle
Area Moments Of Inertia of Common Geometric Shapes
Rectangle
Right Triangular Area
Triangular Area
Circular Area
Hollow circle
This is used for hollow cylinders where there is solid material between the outer and inner radius, but no material between the inner radius and the center, like a pipe's cross-section.
is the outer radius
is the inner radius
Semicircular Area
Quarter Circle
further reading
Statics/Geometric_Properties_of_Solids