Question: 
Write a function to find the surface area of a cylinder.


Model's Code:
def surfacearea_cylinder(radius, height):
    import math
    return 2 * math.pi * radius * (radius + height)



Sample Correct Code:
def surfacearea_cylinder(r,h):
  surfacearea=((2*3.1415*r*r) +(2*3.1415*r*h))
  return surfacearea


Asserts:
assert surfacearea_cylinder(10,5)==942.45
assert surfacearea_cylinder(4,5)==226.18800000000002
assert surfacearea_cylinder(4,10)==351.848


Tests:
Test 1 of 3: FAIL: AssertionError()

Test 574 of 974: 426/574 (74.21602787456446%): failed