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27-Dec-2015View

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<ul><li><p>What are they?Why do we need to draw them?How do you draw them?Exercises.</p></li><li><p>What are they?Prisms are common geometric forms (shapes).Square.Rectangular.Triangular.Hexagonal.Octagonal.</p></li><li><p>Why do we need to draw them?Prisms are used when manufacturing packaging.</p></li><li><p>How do you draw them?</p></li><li><p>If the size of the hexagon is given as A/C or across the corners you need to draw the hexagon inside a circle of the same diameter.Draw a circle to the given diameter, 60mm.</p><p>Using the 30/60 set square divide the circle in to 12.</p><p>Draw horizontal line at the top and bottom where the generators meet the circle.</p></li><li><p>Using the 30/60 set square draw in the four sloping sides.</p><p>Now outline the hexagon.</p></li><li><p>When the size of the hexagon is given as A/C or across the flats, the hexagon is drawn outside the circle.Firstly draw a circle 60mm diameter and divide it in to 12 using the 30/60 set square .Draw the horizontal lines on the top and bottom of the circle where the centre line meets the circle .Using the 30/60 set square draw the four sloping sides. </p><p>Now outline the hexagon. </p></li><li><p>The size of an octagon is given across the flats. As with the hexagon draw the circle 60mm.Add two centre lines.</p><p>Add two vertical and two horizontal lines where the centre line meet the circle.Using the 45 set square, draw in the remaining 4 lines making tangents to the circle.Outline the octagon.</p></li></ul>