
    Design a function for the automated grading system that calculates the total surface area of student-submitted spherical measurements, enabling instant verification of their geometry homework solutions. The function should accept a single radius value from student submissions and return the precise surface area of the sphere using the formula 4πr², where r represents the student's input radius.
    

    
import math

def surfacearea_sphere(r):
    """
    Design a function for the automated grading system that calculates the total surface area of student-submitted spherical measurements, enabling instant verification of their geometry homework solutions. The function should accept a single radius value from student submissions and return the precise surface area of the sphere using the formula 4πr², where r represents the student's input radius.
    

    """
import math

def surfacearea_sphere(r):
    """
    Design a function for the automated grading system that calculates the total surface area of student-submitted spherical measurements, enabling instant verification of their geometry homework solutions. The function should accept a single radius value from student submissions and return the precise surface area of the sphere using the formula 4πr², where r represents the student's input radius.
    

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