Python - math.atan() method example

The math.atan function returns number in radians in the range -math.pi/2 to +math.pi/2. The function calculates the inverted tangent function value.

import math


def calculate_angle(a, b):
    return math.atan(a / b)


#   |\
#   | \ h - for this function this information is not necessary
# a |  \
#   |__*\ <- angle
#     b


# a, b and h build isosceles right triangle
a = 3
b = a
print(calculate_angle(a, b))  # 0.7853981633974483 <-  45 degrees

# a, b and h build half of equilateral triangle
a = 3
b = a * math.sqrt(3)
print(calculate_angle(a, b))  # 0.5235987755982987 <- ~30 degrees

1. Documentation

math.atan(number)

2. Working with degrees

import math


def calculate_angle(a, b):
    angle = math.atan(a / b)

    return (180 / math.pi) * angle


#   |\
#   | \ h - for this function this information is not necessary
# a |  \
#   |__*\ <- angle
#     b


# a, b and h build isosceles right triangle
a = 3
b = a
print(calculate_angle(a, b))  # 0.7853981633974483 <-  45 degrees

# a, b and h build half of equilateral triangle
a = 3
b = a * math.sqrt(3)
print(calculate_angle(a, b))  # 0.5235987755982987 <- ~30 degrees

References

1. Inverse trigonometric functions - Wikipedia