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A section of a solid is the plane figure cut from the solid by passing a plane through it (Kern and Bland 1948, p. 18).

The area of the shadow of a body on a plane, also called the "outer quermass."

A conformal mapping from the upper half-plane to a polygon.

A right angle is an angle equal to half the angle from one end of a line segment to the other. A right angle is pi/2 radians or 90 degrees. A triangle containing a right ...

An angle which is not a right angle or a multiple of a right angle.

In the triangle DeltaABC illustrated above, side c subtends angle ∠C. More generally, given a geometric object O in the plane and a point P, let A be the angle from one edge ...

An angle of less than pi/2 radians (90 degrees) is called an acute angle.

A central angle is an angle ∠AOC with endpoints A and C located on a circle's circumference and vertex O located at the circle's center (Rhoad et al. 1984, p. 420). A central ...

An exterior angle beta of a polygon is the angle formed externally between two adjacent sides. It is therefore equal to 2pi-alpha, where alpha is the corresponding internal ...

The largest area of intersection of a solid body by a plane parallel to a given plane, also called the "HA measurement."