...THIRD. Of the Sphere. DEFTNITIONS. 437. A sphere is a solid terminated by a curved surface all the points of which are equally distant from a point within called the centre. The sphere may be conceived to be generated by the revolution of a semicircle I LIE (Jig. 220) about...

...MEASUREMENT OF ITS ANGLES. Definitions. \ • I. The circumference of a circle is a curve line, all the points of which are equally distant from a point within, called the centre. The circle is the space terminated by this curve line. Note. In common language, the circle is sometimes...

...48. The arc of a quadrant contains 90 degrees, which is the measure of a right angle. 49. An ellipse is a plane figure bounded by a curved line, called the circumference; but as the figure is not a circle, it is described from two points in the loneest diameter, called...

...regular polygon has all its sides and angles equal ; when they are unequal, the polygon is irregular. 38. A circle is a plane figure, bounded by a curved line, called the circumference, which is every where equi-distant from a certain po.int within it, called the centre. H 39. The diameter...

...THIRD. • Of the Sphere. DEFINITIONS. 437. A sphere is a solid terminated by a curved surface all the points of which are equally distant from a point within called the centre. The sphere may be conceived to be generated by the revolution of a semicircle DAE (fig. 220) about...

...P:p::A3:a3. Of the Sphere. • DEFINITIONS. 437. A sphere is a solid terminated by a curved surface all the points of which are equally distant from a point within called the centre. The sphere may be conceived to be generated by the revolution of a semicircle DAE (fig. 220) about...

...described by the point B the circumference of a circle, which we define to be — a curved line fill the points of which are equally distant from a point within called the centre — . The whole space enclosed is called a circle, the moving line AB a radius, and the fixed point...

...THE MEASUREMENT OF ANGLES. Definitions. 1. The circumference of a circle is a curved line, all the points of which are equally distant from a point within, called the centre. The circle is the space terminated by this curved line.* 2. Every straight line, CA, CE, CD, drawn...

...CHAPTER XVIII. THE SPHERE. 415. Definition. A sphere is a solid terminated by a curved surface, all the points of which are equally distant from a point within called the centre. 41G. Corollary. The sphere may be conceived to be generated l,y the revolution of a semicircle, DAE...

...from h to b it will appear retrograde, and from 6 to c it will again appear stationary. Fig. 3. XV. A circle is a plane figure bounded by a curved line, called the circumference, every part of which is equally distant from the centre. XVI. The diameter of a circle is a line drawn...