.. That you entertain as you're at the gas station filling your flat tire with air ?
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well, it turns out there is, or was, a table for trig functions for measurements made in Gradians.
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Jean-Charles de Borda (1733??1799) was a major proponent of the metric system.?ÿ He constructed tables for the trig functions in terms of grads, but they weren't published until two years after his death, Tables of Logarithms of sines, secants, and tangents, co-secants, co-sines, and co-tangents for the Quarter of the Circle divided into 100 degrees, the degree into 100 minutes, and the minute into 100 seconds to ten decimals.?ÿ Encouraged by Borda, surveyors used grads for a while.
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https://www.quora.com/What-is-the-origin-of-the-gradian?share=1
".. That you entertain as you're at the gas station filling your flat tire with air ?"
Forgot to take your med's this morning, eh?
Nice to learn of their origin.?ÿ I thought gradians = grads = gons were still commonplace in Europe and theodolites/total stations offered that as a display option. They wouldn't have become popular unless there were tables to support their use before electronics.
My 1980 vintage HP calculator offers degrees/radians/grads for the trig functions.
My HP15C arrived set to Radians and will reset to Radians, somehow.
Talk about getting the wrong answer with jaw drop and WTF compounded moments.
It has frustrated me to the point that when I turn it on I automatically set it to Degrees before beginning (blue button 7).
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I have a couple of HP 15C calculators. On both of mine if it is set to radian mode blue 8 key it will show on the lower middle part of the display RAD. Is set to degree with the blue 7 key it will not show a warning. The RAD will stay displayed if the calculator is turned off and back on. In the degree mode no warning is displayed. If the blue 7 key is pressed it should stay in the degree mode.
The instruction booklet says in the Radian mode the RAD annunciator appears in the display, also if Blue Grad key is pressed the warning GRAD appears and stays in the display.
In the degree mode make sure you are using Decimal Degrees for the calculation.
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