A school geometry. containing the substance of Euclid books II anfd III and part of book IV (1917)
Hall, H. S. (Henry Sinclair), 1848-1934, Stevens, F. H. (Frederick Haller), 1852-1933 · London : Macmillan · leaf 86
Suppose the circle divided into any even number of sectors havingequal central angles : denote the number of sectors b} n. Let the sectors be placed side by side as represented in the diagram ;then the area of the circle = the area of the fig. ABCD ; and this is true however great n may be. Now as…
Geometry
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