### Tell us what’s happening:

Your angle method should return the value of the private attribute __angle converted to degrees. The error i get when using this line of code, im assuming it’s got something to do with line 57, isn’t that the attribute it’s talking about? I tried returning math.radians(angle) but not only did it not work it woudn’t make sense because there is not mentioning of an instance and that is an instance

### Your code so far

```
import math
GRAVITATIONAL_ACCELERATION = 9.81
PROJECTILE = "∙"
x_axis_tick = "T"
y_axis_tick = "⊣"
class Projectile:
__slots__ = ('__speed', '__height', '__angle')
def __init__(self, speed, height, angle):
self.__speed = speed
self.__height = height
self.__angle = math.radians(angle)
def __str__(self):
return f'''
Projectile details:
speed: {self.__speed} m/s
height: {self.__height} m
angle: {round(math.degrees(self.__angle))}°
displacement: {round(self.__calculate_displacement(), 1)} m
'''
def __calculate_displacement(self):
horizontal_component = self.__speed * math.cos(self.__angle)
vertical_component = self.__speed * math.sin(self.__angle)
squared_component = vertical_component**2
gh_component = 2 * GRAVITATIONAL_ACCELERATION * self.__height
sqrt_component = math.sqrt(squared_component + gh_component)
return horizontal_component * (vertical_component + sqrt_component) / GRAVITATIONAL_ACCELERATION
def __calculate_y_coordinate(self, x):
height_component = self.__height
angle_component = math.tan(self.__angle) * x
acceleration_component = GRAVITATIONAL_ACCELERATION * x ** 2 / (
2 * self.__speed ** 2 * math.cos(self.__angle) ** 2)
y_coordinate = height_component + angle_component - acceleration_component
return y_coordinate
def calculate_all_coordinates(self):
return [
(x, self.__calculate_y_coordinate(x))
for x in range(math.ceil(self.__calculate_displacement()))
]
# User Editable Region
@property
def speed(self):
return self.__speed
@property
def height(self):
return self.__height
@property
def angle(self):
return self.__angle
# User Editable Region
ball = Projectile(10, 3, 45)
print(ball)
coordinates = ball.calculate_all_coordinates()
```

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### Challenge Information:

Learn Encapsulation by Building a Projectile Trajectory Calculator - Step 9