Practical Geometry for Second Grade Art-pupils and Private Schools

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London, 1881 - Geometry - 160 pages
 

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Page 37 - 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.
Page 12 - A rhombus has all its sides equal, but its angles are not right angles.
Page 11 - Therefore each of the angles DCF, ECF is a right angle. Wherefore from the given point C, in the given straight line AB, FC has been drawn at right angles to AB.

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