Question

if cosA=0.25 then find the value of A in degrees​

Answer 1

Given cosA = 0.25. In order to find the value of angle A, we need to do the inverse cos of given value. A = cos^-1 (0.25) => A = 75.52 degrees. So the angle made by the two rays will be 75.52 degrees.

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Answer 2

cos A = 0.25

cos A= 1/4

sin 30degree = 1/4= cosA

so sin(90-60)degrees= cos30degree

so cos A= cos30degree

=) A = 30 degree