- to discover an error in form orI proportion, when 3ou view a drawing from all sides.! Hence, alwajs insist that your pupils examine their sketches in this way before they line in their forms. But they should hold the book in a vertical position,i and directly in front of the eye ; otherwise the… … 64 TEACHERS MANUAL. Quadrilaterals. A Quadrilateral. — Any 2-)lane figure having fourstraight sides is called a quadrilateral. If it has four right angles, it is also called a rectan-gle. The term • rectangle, therefore, embraces lessthan the term •• quadiilateral. A Square. — A 2:)lane figure…
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