• How to use the Bradis table?

    Evgeny Fogov
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    ��������������������������������������������March 15, 2013
    10749
    How to use the Bradis table?

    Today, there are many computational tools that can be used to solve problems, both complex and very simple. But, nevertheless, the tables of Bradis are no less relevant today than a few decades ago. But how to use the Bradis table, not all high school students and university students know. Consider the use of these tables on the example of solving problems with sine values. By the way, you can not buy in printed form the data tables, as they are offered on the Internet here.

    Sinuses

    Open the page with sinuses. Now look at the condition of the problem, in which dimension you are given an angle - in degrees, radians or minutes. The fact is that in the tables of Bradis the figures are given only in minutes and degrees. Therefore, if the value of your angle is different, then you need to translate it in degrees or minutes. To convert the angle from radians to degrees, use the formula a = b * 180 � / π, where b is the angle in radians and α in degrees.

    The table is a series, located both vertically and horizontally. In the outermost row on the left, in its left corner is "sin". Further, under it are the numbers in the column (they are with the designation of degrees). These are integer degrees. Find the whole angle indicator you need, and then in the top line look for the number corresponding to the fractional angle index. At the intersection of the column and row will be the value that you need.

    Minutes

    If you use the Bradis table in minutes, they are listed in the table not in a row, but after 6. That is, the Bradis table can be used to find an angle with a multiple of the number �6�. Cosines, how to use a table if, for example, an angle is given in minutes, a value of 19? To do this, use the corrections located in the right side of the table on the "Cosines" page. It is necessary to find the difference between the nearest multiple "6" number and a given angle value. When the difference is from 1 to 3, the value found is added to the last digit of the cosine of the smaller angle, and if the difference is 4 or 5, subtract the correction value from the last digit of the larger angle.


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