How to Find a 122 Degree Angle
Accurately finding angles is an important skill and getting it wrong can be both expensive and dangerous. The NASA Mars Climate Orbiter blew itself apart after entering orbit around Mars at too steep an angle. Many different techniques exist for measuring and creating angles, from the complex computer maths used by NASA through to the more traditional tools, protractors and set squares. Protractors are easy to use, cheap to acquire and accurate for most purposes. Using a protractor to find a 122-degree angle is straightforward.
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Instructions
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1
Draw a straight line on a piece of paper along the baseline of the protractor, linking the "0" mark on the left to the "180" mark on the right. Make a small mark intersecting the straight line near the middle.
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2
Superimpose the protractor baseline on the line you drew. Adjust the position of the protractor until the center mark is directly over the intersecting mark on the line.
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3
Measure visually around the outer edge of the protractor, and locate the 122-degree mark. Draw a dot or a short line to identify it.
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4
Draw a straight line joining the 122-degree mark and the intersecting mark on the base line. The baseline and the 122-degree line form an angle of 122 degrees.
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Place the protractor over the angle just drawn. Align the protractor with the lines forming the angle. Check the outer edge of the protractor to confirm that your angle is exactly 122 degrees.
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Tips & Warnings
Use a sharp pencil to produce thin lines and thus decrease the margin of error.
Accuracy is important. The difference between 122 and 123 degrees may be only the thickness of a pencil tip.
References
- Photo Credit Stockbyte/Stockbyte/Getty Images
