. It is sometimes, in popular usage, called a simple curve. A PLANE CURVED FIGURE. 107 The Circle and its Parts. A circle may be struck with open compasses ; onefoot of the compasses beingfixed, and marking the centreof the circle, the other re-volving, and tracing the cir-cumference : hence its… … A Circle. — A circle is a plane figure boundedby a curve^ called its circumference, cdl jxirts of whichare at the same distance from a point icithin, ccdledthe centre. This is the strict mathematical use of the word circle, and makes it consist of the space enclosedby the curve. In popular usage…
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