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Geometry

Degrees, minutes and seconds

Convert an angle between decimal degrees (35.5125) and degrees-minutes-seconds (35°30'45").

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One degree is divided into 60 minutes, and one minute into 60 seconds. So 35°30'45" is 35 + 30/60 + 45/3600 = 35.5125 degrees.

Make sure the calculator is in degree mode when you enter an angle in this form.

Natural Scientific 991

Start on the main screen: Press MENU, then 1 (Calculate) to return to the main calculation screen. AC clears the line you are on.

  1. Type 35.5125 and press =.

    35.5125=

  2. Press the °' " key. The decimal angle changes to degrees, minutes and seconds.

    °'"

You should see35°30'45"

Natural Scientific 991 key reference

Classic Scientific 30

Start on the main screen: Press 2nd then mode (QUIT) to leave any menu or screen and return to the calculation screen.

  1. Type 35.5125, then press 2nd and the prb key to open the ANGLE menu. Choose item 5, ►DMS, and press enter.

    35.51252ndangleprb5enter

You should see35.5125►DMS 35°30'45"

Classic Scientific 30 key reference

Classic Graphing 84

Start on the main screen: Press 2nd then mode (QUIT) to get back to the home screen. Pressing clear on a menu also backs out of it.

  1. Type 35.5125, press 2nd then apps for the ANGLE menu and choose 4, ►DMS. Press enter.

    35.51252ndANGLEapps4enter

  2. To go the other way, add the parts yourself: 35 + 30 ÷ 60 + 45 ÷ 3600.

    35+30÷60+45÷3600enter

You should see35+30/60+45/3600 35.5125

This calculator starts in radian mode, so typing the ° mark on a number would convert it to radians. Adding the parts avoids that.

Classic Graphing 84 key reference

RPN Scientific 15

Start on the main screen: There is no menu to leave. Press the back arrow to clear a number you are typing, or CLx (g then back arrow) to clear the X register.

  1. RPN calculators write DMS as DD.MMSS. Key in 35.3045 for 35°30'45".

    35.3045

  2. Press g then 2 (→H) to turn it into decimal degrees.

    g→H2

You should see35.5125

Press f then 2 (→H.MS) to go back from decimal degrees to DD.MMSS.

RPN Scientific 15 key reference

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