As a decimal: 0.866
As a fraction: √(3)/2
60 degrees = 0.5 1/2
Fora right angle triangle: cosine angle = adjacent/hypotenuse
First make sure your calculator is in 'Degree Mode (D)'. Then using the 'Inverse' of 'Sin' , shown as 'ArcSin' or ' Sin^(-1)' . enter '0.5', followed by '=' . The answer should be '30' ( 30 degrees).
tan(30 deg) = 0.5774, approx.
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(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)
It depends on the length of the other two sides which creates that angle. Not enough information was given. However, you can simply use the Cosine rule to find it if the other two lengths are known. a2=b2+c2- 2bccosA (A=30 and a is the length of the side opposite to 30 degree angle; b and c is the length of the sides which makes up the 30 degree angle)
30 degree angle
Cos(65 deg) = 0.4226 approx.
Yes.
a 60 degree angle is twice the size of a 30 degree angle.
The takeoff for a 30 degree angle will depend with the offset angle.
Find the cosine of 38 degrees and then find its reciprocal.