# Warm up calculations

import math

print(int((8**4) / (50*31)))
print(int((3+9) * math.sqrt(5)))

2
26

# Taxes

def tax(price):
    """Return the given price with tax added to it"""
    return(price*1.13)

# Tests
assert abs(tax(10) - 11.300) < 0.001, "10 dollars"

# Circle Area

import math

def find_radius(area: float) -> float:
    """Return the radius of a circle 
    given its area"""
    return math.sqrt(area / math.pi)
    
    
def find_circumference(area: float) -> float:
    """Return the circumference of a circle 
    given its area"""
    r = find_radius(area)
    return(2*math.pi*r)
    
# Tests
assert abs(find_radius(30) - 3.0901) < 0.001, "radius test" 
assert abs(find_circumference(30) - 19.5) < 0.1, "circumference test"