QUINDECAGON

, is a plane figure of 15 angles, and consequently the same number of sides. When those are all equal, it is a regular Quindecagon, otherwise not.

Euclid shews how to inscribe this figure in a circle, prop. 16, lib. 4. And the side of a regular Quindecagon, so inscribed, is equal in power to the half difference between the side of the equilateral triangle, and the side of the pentagon; and also to the difference of the perpendiculars let fall on both sides, taken together.

QUINQUAGESIMA-Sunday, is the same as Shrove-Sunday, and is so called as being about the 50th day before Easter, being indeed the 7th Sunday before it. Anciently the term Quinquagesima was used for Whitsunday, and for the 50 days between Easter and Whitsunday; but to distinguish this Quinquagesima from that before Easter, it was called the paschal Quinquagesima.