1.S: Centers of Mass (Summary)
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SUMMARY
Triangular lamina: 2/3 of way from vertex to midpoint of opposite side
Solid Tetrahedron, Pyramid, Cone: 3/4 of way from vertex to centroid of opposite face.
Hollow cone: 2/3 of way from vertex to midpoint of base.
Semicircular lamina: 4a3π
Lamina in form of a sector of a circle, angle 2α : (2asinα)(3α)
Semicircular wire: 2aπ
Wire in form of an arc of a circle, angle 2α : (asinα)α
Solid hemisphere: 3a8
Hollow hemisphere: a2