Methods can also take more arguments than just `self`

:

```
class DistanceConverter:
kms_in_a_mile = 1.609
def how_many_kms(self, miles):
return miles * self.kms_in_a_mile
converter = DistanceConverter()
kms_in_5_miles = converter.how_many_kms(5)
print(kms_in_5_miles)
# prints "8.045"
```

Above we defined a `DistanceConverter`

class, instantiated it, and used it to convert 5 miles into kilometers. Notice again that even though `how_many_kms`

takes two arguments in its definition, we only pass `miles`

, because `self`

is implicitly passed (and refers to the object `converter`

).

### Instructions

**1.**

It’s March 14th (known in some places as **Pi day**) at *Jan van High*, and you’re feeling awfully festive. You decide to create a program that calculates the area of a circle.

Create a `Circle`

class with class variable `pi`

. Set `pi`

to the approximation `3.14`

.

**2.**

Give `Circle`

an `area`

method that takes two parameters: `self`

and `radius`

.

Return the area as given by this formula:

`area = pi * radius ** 2`

**3.**

Create an instance of `Circle`

. Save it into the variable `circle`

.

**4.**

You go to measure several circles you happen to find around.

- A medium pizza that is 12 inches across.
- Your teaching table which is 36 inches across.
- The Round Room auditorium, which is 11,460 inches across.

You save the areas of these three things into `pizza_area`

, `teaching_table_area`

, and `round_room_area`

.

Remember that the `radius`

of a circle is half the diameter. We gave three diameters here, so halve them before you calculate the given circle’s area.