Even the vegetable world contributed to the wonders of Christmas, for was there not the famous Glastonbury Thorn which blossomed on old Christmas day? Legend says that this was the walking staff of Joseph of Arimathaea, who, after Christ's de... Read more of The Glastonbury Thorn Its Legend at Christmas Story.caInformational Site Network Informational
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Focal Points

The focal point of a circle is its center, and is called the focus. But an ellipse has two focal points, called foci, represented by F, F in Fig. 148, and by B, B in Fig. 149.
A produced line is one which extends out beyond the marking point. Thus in Fig. 148 that part of the line K between F and G represents the produced portion of line K.
Fig. 149. Fig. 149.

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