Solve each problem. See Example 6. Surveying One student in a surveying class measures an angle as 74.25°, while another student measures the same angle as 74° 20' . Find the difference between these measurements, both to the nearest minute and to the nearest hundredth of a degree.

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First, convert both angle measurements into a consistent format. The first measurement is already in decimal degrees: 74.25°.

Convert the second measurement, 74° 20', into decimal degrees. Recall that 1 minute (') equals \( \frac{1}{60} \) degrees, so calculate the decimal equivalent of 20 minutes as \( 20 \times \frac{1}{60} \).

Add the decimal equivalent of the minutes to the degrees in the second measurement to get the full decimal degree value.

Find the difference between the two decimal degree values by subtracting the smaller from the larger.

To express the difference to the nearest minute, convert the decimal difference back into degrees and minutes by multiplying the decimal part by 60, then round to the nearest whole minute.

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주요 개념

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Angle Measurement Units

Angles can be measured in degrees, minutes, and seconds, where 1 degree equals 60 minutes and 1 minute equals 60 seconds. Understanding how to convert between decimal degrees and degrees-minutes-seconds (DMS) is essential for comparing and calculating differences in angle measurements.

Conversion Between Decimal Degrees and DMS

To convert decimal degrees to degrees and minutes, separate the integer part as degrees and multiply the decimal part by 60 to get minutes. Conversely, to convert from degrees and minutes to decimal degrees, divide the minutes by 60 and add to the degrees. This conversion allows for accurate comparison and calculation.

Rounding and Precision in Angle Measurements

Rounding angle measurements to the nearest minute or hundredth of a degree requires understanding place value and precision. Proper rounding ensures that the difference between measurements is expressed accurately and meaningfully, which is important in fields like surveying where precision matters.