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The 3D graphic below shows an image of the Tom Clarke Bridge in Dublin - Leaving Cert DCG - Question A-3 - 2017
Question A-3
The 3D graphic below shows an image of the Tom Clarke Bridge in Dublin. This bridge was constructed in 1984. The bridge can be raised as shown in the graphic to ena... show full transcript
Worked Solution & Example Answer:The 3D graphic below shows an image of the Tom Clarke Bridge in Dublin - Leaving Cert DCG - Question A-3 - 2017
Step 1
Draw the bridge in the open position
Answer
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Identify the Initial Position: Begin by drawing the bridge in its closed position. Represent the horizontal component from point P to the elevation of the bridge.
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Locate Point A and Angle: Determine the location of point A, which is where the bridge pivots. Indicate that the bridge will rotate upwards through an angle of 60°.
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Draw the Pivoting Arc: Use a compass or curved line to illustrate the arc of the bridge's movement as it opens. This arc should form a 60° angle with the horizontal line from point P.
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Mark Point A1: After the 60° rotation, mark the new position of point A as A1, ensuring it lies on the end of the arc drawn in step 3.
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Complete the Structure: Finally, connect the newly drawn position of A1 back to point P, completing the shape of the open bridge. Ensure all parts are proportionate and clear.