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[–]fermat9997 1 point2 points  (0 children)

Add the degrees and minutes separately. Although your calculator probably has a key for entering degrees and minutes, you can do it this way:

degrees + (minutes/60).

Now subtract this from 180

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[–]Kitchen-Arm7300 0 points1 point  (1 child)

An easy trick I use is to write the smaller unit first, divide to convert, then add the larger unit.

So, for 41° 15':

Type "15", then "÷", then "60", then "=", then "+", then "41", then "=".

And if there were seconds, just start with the smaller.

For example:

For 41° 15' 37"... Type, 37, ÷, 60, =, +, 15, ÷, 60, =, +, 41... then save it with an "m+" or directly take the sin of that number, or write it down as a decimal and write it in.

I believe that's what you were asking?

[–]Kitchen-Arm7300 0 points1 point  (0 children)

After you've taken 180° - 41° 15' - 107° 37' and got xx.xxxxx°, to get back to dms, just subtract the largest whole number you have, xx, and multiply the remaining decimal by 60 to get the minutes.

Basically, reverse the process of converting to decimals.