Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 108
eters, will also beproportional to the squares of the circumferences THEOREM XXVI. The area of a regular polygon inscribed in a circle, is equal toIwlf the product of the perimeter and the perpendicular let fallfrwn the centre on one of the sides. Let C be the centre of a circle cir-cumscribing the… … 103 GEOMETRY. Area of Circle. equal triangles as the polygon hassides, in each of which the perpen-dicular on the base will be equal toCD. Now, the area of one of them,as A CB, will be equal to half the pro-duct of CD by the base AB; and thesame will be true for each of the othertriangles : hence,…
Geometry · Plane trigonometry
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