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en.wikipedia.org/wiki/Solid_angle

In geometry, a solid angle (symbol: Ω) is the two-dimensional angle in three- dimensional space ... 3.1 Cone, spherical cap, hemisphere; 3.2 Tetrahedron; 3.3 Pyramid ... The solid angle of a sphere measured from any point in its interior is 4 π sr, ..... where φi ranges over all six of the dihedral angles between any two planes ...

Which is a solid consisting of a disc a point not in the same plane as the disc but directly above the center of the disc and all points between them? A right cone ...

www.mathopenref.com/circle.html

There is a difference between a circle and a disk. A circle is a line, ... All points on the circle are equidistant (same distance) from the center point. Radius, The ...

math.stackexchange.com/questions/1981695/what-shape-is-a-calippo

Oct 23, 2016 ... Then, we can parameterize Pθ on the circle, and companion point Qθ on the segment . ... so that the line between them has equation .... The set C is the union of all solid cones with tips on σ and base Dr. The plane z=th, 0≤t≤1, intersects any such cone in a disc of radius r(1−t) with center on the line ...

www.andrew.cmu.edu/user/ramesh/teaching/course/48-175/lectures/8.SolidsAndSurfaces.pdf

Points can be inside a solid (indeed, a surface or any geometric figure), on the boundary ... by walls, floors and ceilings, are solids as are the physical elements that enclose them. ... The collection of points on the disc for all such discs constitutes a rotational ..... find the intersection point(s) between the line and the cone.

Finding the solid of revolution (constructed by revolving around the x-axis) using the disk ... 0 energy points ... c f(x) dx = c ∫ f(x) dx for any real number c, including pi. ... Show all 9 answers to Moses's question • Answer this question ..... Here is one of them:https://www.khanacademy.org/cs/3d-surface-viewer-2/ 1092842126 ...