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This is an example of converting or changing degrees, minutes, seconds, into decimal degrees.

Take note that ° is the symbol of degrees, ' is the symbol of minutes, and
'' is the symbol of seconds.

Take note also that;
1° = 60'
1' = 60''

We will now start converting the given to decimal degrees.
Given: 47°12'20''
        = 47°12'20''(1'/60)
        = 47°12'+0.33'
        = 47°12.33'(1°/60')
        = 47°+0.21°
        = 47.21°

Therefore, 47°12'20'' is equal to 47.21°