This is a simple C# program code to find area of a rectangle, circle and triangle with user interface and example.
Manually we can find the area of a rectangle by using equation:
Area = Breadth * Length.
Also we can find the area of a circle by using equation:
Area = 3.14 * (radius)2
Also we can find the area of a triangle by using equation:
a = length of first side
b = length of second side
c = length of third side
s = (a + b+ c)/2
Area = sqrt(s*(s-a)*(s-b)*(s-c))
-where sqrt stands for square root
User interface with example:

Here ‘Find Area’ is the ‘button_1’. There are three tabs: One is for ‘Rectangle’, another one is for ‘Triangle’ and last is for ‘Circle’.
Code Behind interface:
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; namespace area { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { if (tabControl1.SelectedTab == tabPage1) { double breadth = Convert.ToDouble(textBox1.Text); double lenght = Convert.ToDouble(textBox2.Text); label5.Text = (breadth * lenght).ToString(); } if (tabControl1.SelectedTab == tabPage2) { double a = Convert.ToDouble(textBox4.Text); double b = Convert.ToDouble(textBox5.Text); double c = Convert.ToDouble(textBox6.Text); double s = (a + b + c) / 2; double Area = Math.Sqrt(s * (s - a) * (s - b) * (s - c)); label5.Text = (Area).ToString(); } if (tabControl1.SelectedTab == tabPage3) { double radius = Convert.ToDouble(textBox3.Text); label5.Text = (3.14 * radius).ToString(); } } } }
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