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Start with a given ray. |
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| Step 1 |
Pick a point not on the line, about 6 cm from the endpoint of the ray.
Its exact location is not important. Label it D. |
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| Step 2 |
Set the compass on point D and set its width to the endpoint of the ray. |
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| Step 3 |
Draw an arc that crosses the ray and extends over and above the ray endpoint.
(If you prefer, draw a complete circle.) |
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| Step 4 |
Draw a diameter through D from the point where the arc crosses the ray. |
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| Step 5 |
Draw a line from the ray's endpoint to the endpoint of the diameter line |
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| Step 6 |
Done. The last line drawn is perpendicular to the ray. |
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