[C#] คำนวณพื้นที่ + เส้นรอบวง วงกลม

โค้ด

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        const double PI = 3.14159;

        private void btArea_Click(object sender, EventArgs e)
        {
            double radius = Convert.ToDouble(txtRadius.Text);
            double area = PI * radius * radius;
            MessageBox.Show("The arae of circle = " + area.ToString("#,###.##"), "Area");
        }

        private void btCircumference_Click(object sender, EventArgs e)
        {
            double radius = Convert.ToDouble(txtRadius.Text);
            double circumference = 2 * PI * radius;
            MessageBox.Show("The circumference of circle = " + circumference.ToString("#,###.##"), "Circumference");
        }
    }
}

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