Write a function to find the surface area of a cone.
import math
def surfacearea_cone(r,h):
  l = math.sqrt(r * r + h * h)
  SA = math.pi * r * (r + l)
  return SA
<s>[INST]<<SYS>>Given a task and its code, generate test cases for the code.<</SYS>>Write a function to find the surface area of a cone.
import math
def surfacearea_cone(r,h):
  l = math.sqrt(r * r + h * h)
  SA = math.pi * r * (r + l)
  return SA[/INST]assert surfacearea_cone(5,12)==282.7433388230814
assert surfacearea_cone(10,15)==880.5179353159282
assert surfacearea_cone(19,17)==2655.923961165254</s>