The fourth book deals with the circle in its relations to inscribed and circumscribed triangles, quadrilaterals and regular polygons.

46I had prepared some cards with quadrilaterals drawn on them.

32Owing to the small size of the experimental wire, the method is very quick and sensitive, and the apparatus can be set up in a few minutes when once the experimental quadrilaterals have been made.

36quadrilaterals, hexagons, &c., all of which are rectilineal figures, a triangle is "differentiated" as having three sides.

1437 The mensuration of earthwork involves consideration of quadrilaterals whose dimensions are given by special data, and of prismoids whose sections are D such quadrilaterals.

14When dealing with maps not drawn on an equal area projection we substitute quadrilaterals bounded by meridians and parallels, the areas for which are given in the " Smithsonian Geographical Tables " (1894), in Professor H.

15cyclic quadrilaterals.

00quadrilaterals drawn on them.

00In the poster competition, we had to make a poster and answer three questions on cyclic quadrilaterals.

00quadrilaterals in circles are equal to two right angles.

00The opposite angles of quadrilaterals in circles are equal to two right angles.

00

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