...circle is a plane figure contained by one line, which is called the circumference and is such that all lines drawn from a certain point within the figure...equal to one another: 16. And this point is called the center of the circle. It is evident that in the first of these statements, if ' point ' is defined,...

...extremity of anything. 11. A figure is that Fig. 3. which is enclosed by one or more boundaries. 12. A. circle is a plane figure contained by one line,...point within the figure to the circumference are equal (Fig. 4). 13. And this point is called the centre of the circle (Fig. 4,0). 14. A diameter of a circle...

...r2 + R/ + rl) Slant height (/) = V/.2 + (Rr)2 8. Sphere : A sphere is a solid bounded by one surface and is such that all straight lines drawn from a certain point within the solid to the bounding surface are equal. This certain point is called the centre of the sphere. A line...