Measuring Angles Using Diagonal Lines

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This Demonstration shows diagonal lines on a circle with precision 10'. To estimate the number of minutes, try to find which grid corner most nearly intersects the red line. The vertical coordinate of that corner in the grid is the estimate.
Contributed by: Izidor Hafner (November 2012)
Open content licensed under CC BY-NC-SA
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"Measuring Angles Using Diagonal Lines"
http://demonstrations.wolfram.com/MeasuringAnglesUsingDiagonalLines/
Wolfram Demonstrations Project
Published: November 29 2012