Question

I have programmed a maths program in python but the only problem is with the trigonometry section that some answers need to be in degrees and not radians. How do I convert into degrees? I have tried
x = input("value: ")
y = math.degrees(x) #gives me the wrong answer

and:

x = input("input: ")
y = x*180/math.pi #still wrong output

Answer 1

Please post a test case,with wrong output and desired output.

Answer 2

math.cos(x) =>length of the adjacent side of the right triangle inscribed in a circle with angle x radians

Answer 3

math.radians(x) =>returns radians
1 deg => 0.01745 rad
1 rad =>57.30659 deg

Answer 4

180 degrees is the same measure as pi radians; so the conversion you have set up is good;

180
x radians * ----- = degrees
pi

the logic of course being that you divide out the pi and stretch it to fit the degrees.

Answer 5

How are you determining the value attributed to the input of 'x' ? if that value is off, it would produce erroneous results :)

Answer 6

This:

def cosine():
print ' '
b = input(90)
x = math.cos(b)
y = math.degrees(x)
print ' '
return y

Returns: -25.6727271154

and

def cosine():
print ' '
b = input(90)
x = math.cos(b)
y = x*(180/math.pi)
print ' '
return y

returns the same value

pure radians is

def cosine():
print ' '
b = input(90)
x = math.cos(b)
print ' '
return x

returns: -0.448073616129

Answer 7

Input is actually the angle that the user inputs but for all of these I have just used 90

Answer 8

if your input is in degrees; change it to radians before passing it thru the function and see how that helps :)

In javascript, the input is read AS radians to begin with.

b = 90*Math.PI/180
x = Math.cos(b)

Might help :)

Answer 9

In that little tidbit; the raw input is translated as radians ...

Answer 10

this is the revised version that converts the input into radians; calcultaes the cosine, and then converts it back as degrees...

Answer 11

The answer that gives me is:

6.12323399574e-17

Answer 12

the cos of 90 is not 6.12323399574e-17 as far as I know it's 0