The Radii, or Rays, of a circle, are direct or right lines drawn from its centre to its .. . circumference: Radius, from the Latin, meaning a Ray a Radii, / \ \ Rays. ... If a right line be drawn from any one point of the cir- ^ cumference of a circle to another, without passing through its centre ... angle, and that which is of less than 90 degrees an Acute angle. angles of using, the involved. 8. To facilitate the operations.
|Title||:||The American drawing-book: a manual for the amateur, and basis of study for the professional artist: especially adapted to the use of public and private schools, as well as home instruction|
|Author||:||John Gadsby Chapman|