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C Program: Surface Area of a Hemisphere

Introduction

A hemisphere is half of a sphere. It has two parts in its surface area:

1. Curved Surface Area (CSA):

2πr²

1. Total Surface Area (TSA):

3πr²

where

• r = radius of the hemisphere
• π (pi) ≈ 3.14159

In this program, we will calculate the Total Surface Area (TSA).

C Program: Surface Area of a Hemisphere

#include <stdio.h>
#define PI 3.14159   // Define constant PI
 
int main() {
    float radius, surface_area;
 
    // Input radius
    printf("Enter the radius of the hemisphere: ");
    scanf("%f", &radius);
 
    // Calculate total surface area
    surface_area = 3 * PI * radius * radius;
 
    // Display result
    printf("Surface Area of Hemisphere = %.2f\n", surface_area);
 
    return 0;
}
 

 
OUTPUT 1 :
Enter the radius of the hemisphere: 6
Surface Area of Hemisphere = 339.29



OUTPUT 2 :
Enter the radius of the hemisphere: 4.5
Surface Area of Hemisphere = 190.85

Explanation

• The user inputs the radius of the hemisphere.
• Formula applied: 3 × π × r².
• The program prints the total surface area with two decimal places.