 | Canadian Mining Institute - Mineral industries - 1912 - 778 pages
...know from Euclid that the sum of the interior angles of any closed figure bounded by straight lines is equal to twice as many right angles as the figure has sides less four right angles; figure A has 12 sides, therefore, the interior angles are equal to 20 right... | |
 | Hippolyte Taine - Psychology - 1998 - 596 pages
...to the weight of the liquid they displace. In every polygon, the sum of the internal angles together with four right angles is equal to twice as many right angles as the figure has sides. — Here are laws; each of them consists in a couple of general and abstract characters which are connected.... | |
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All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sides. 
