This can be done on a graphing calculator by making sure you have your calculator in degrees mode, and then tentering the cos(23). You get an answer of 0.9205048535.
60 degrees = 0.5 1/2
As a decimal: 0.866 As a fraction: √(3)/2
Fora right angle triangle: cosine angle = adjacent/hypotenuse
The cosine of theta is adjacent over hypotenuse, given a right triangle, theta not being the 90 degree angle, adjacent not being the hypotenuse, and theta being the angle between adjacent and hypotenuse. In a unit triangle, i.e. in a unit circle circumscribed with radius one, and theta and the center of the circle at the origin, cosine of theta is X.
Cosine (23) = Cos(23 degrees) = 0.920504853... ~ 0.9205
cosine(59 degrees) = 0.51504 (rounded)
60 degrees = 0.5 1/2
at a 45 degree angle, or pi/4
45 degree
cos(50) = 0.6428 (rounded)
Cos(65 deg) = 0.4226 approx.
As a decimal: 0.866 As a fraction: √(3)/2
Find the cosine of 38 degrees and then find its reciprocal.
Fora right angle triangle: cosine angle = adjacent/hypotenuse
The number 1.414... (square root of 2) is two times the cosine or sine of a 45 degree angle. The reason for this is that for a 45 degree angle, the two sides are cosine and sine, they are equal, and if you solve using the Pythagorean theorem with a hypotenuse of 1, the two sides are each (21/2)/2.
The cosine function is mathematical equation to determine the adjacent angle of a triangle. The cosine of an angle is the ratio of the length of the hypotenuse: so called because it is the sine of the co-angle.
In a right triangle, the cosine of an angle is defined as the ratio of the adjacent side of that angle to the hypotenuse.