
    Design an algorithm to calculate the total sensor coverage area of a spherical vital signs monitoring device, where the device's effectiveness depends on the surface area available for biosensor placement. The monitoring device is perfectly spherical, and the coverage area must be calculated in square centimeters to determine if sufficient biosensor distribution can be achieved for accurate patient vital sign tracking.
    

    
import math

def surfacearea_sphere(r):
    """
    Design an algorithm to calculate the total sensor coverage area of a spherical vital signs monitoring device, where the device's effectiveness depends on the surface area available for biosensor placement. The monitoring device is perfectly spherical, and the coverage area must be calculated in square centimeters to determine if sufficient biosensor distribution can be achieved for accurate patient vital sign tracking.
    

    """
import math

def surfacearea_sphere(r):
    """
    Design an algorithm to calculate the total sensor coverage area of a spherical vital signs monitoring device, where the device's effectiveness depends on the surface area available for biosensor placement. The monitoring device is perfectly spherical, and the coverage area must be calculated in square centimeters to determine if sufficient biosensor distribution can be achieved for accurate patient vital sign tracking.
    

    """
    surfacearea = 4 * math.pi * r * r
    return surfacearea