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SQRT

The SQRT function can be used to return the positive square root of a number or in conjunction with the cosine and radians to return the length of an unknown where the square root of 64 is 8, as shown in Figure 14.12. Or in other words, The SQRT function can be used to return the positive square root of a number as shown in cell C19 of Figure 14.12 where the square root of 64 is shown to be 8. It can also be used in trigonometric calculations, for example, in conjunction with the cosine and radian functions, using the law of cosines, to return the length of the side of a triangle where the length of the other two sides and the size of the angle between them is known. In Figure 14.12 this formula is used to calculate the length of side b of the triangle (cell C14):

Figure 14.12. The SQRT function can be used to return the positive square root of a number or in conjunction with the cosine and radians to return the length of an unknown.



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