각도 변환기

import math

def degrees_to_radians(deg):
    return deg * math.pi / 180

def radians_to_degrees(rad):
    return rad * 180 / math.pi

def degrees_to_gradians(deg):
    return deg * 400 / 360  # or deg * 10/9

def gradians_to_degrees(grad):
    return grad * 360 / 400

# Examples
print(degrees_to_radians(90))    # 1.5707963... (π/2)
print(degrees_to_radians(180))   # 3.1415926... (π)
print(radians_to_degrees(math.pi))  # 180.0
print(degrees_to_gradians(90))   # 100.0

# Python also provides math.radians() and math.degrees()
print(math.radians(45))          # 0.7853981...
print(math.degrees(math.pi / 4)) # 45.0