Question: 
Write a function to find the diameter of a circle.


Model's Code:
def diameter_circle(radius):
    return radius * 2



Sample Correct Code:
def diameter_circle(r):
  diameter=2*r
  return diameter


Asserts:
assert diameter_circle(10)==20
assert diameter_circle(40)==80
assert diameter_circle(15)==30


Tests:
Test 1 of 3: PASS
Test 2 of 3: PASS
Test 3 of 3: PASS

Test 499 of 974: 368/499 (73.74749498997996%): success