Practical Geometry for Second Grade Art-pupils and Private Schools

Forside
London, 1881 - 160 sider

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Side 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.
Side 12 - A rhombus has all its sides equal, but its angles are not right angles.
Side 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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