3FacePyramid Sizes

Form1.cs

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 _3FacePyramid
{
	public partial class Form1 : Form
	{
		double display_width, display_height;
		double side, main;

		private double get_triangle_area(double a, double b, double c)
		{
			double p = (a + b + c) / 2.0;
			return Math.Sqrt(p * (p - a) * (p - b) * (p - c));
		}

		private void height_KeyDown(object sender, KeyEventArgs e)
		{
			if (e.KeyCode == Keys.Enter)
			{
				button1.PerformClick();
				e.Handled = true;
				e.SuppressKeyPress = true;
			}
		}

		private void width_KeyDown(object sender, KeyEventArgs e)
		{
			if (e.KeyCode == Keys.Enter)
			{
				button1.PerformClick();
				e.Handled = true;
				e.SuppressKeyPress = true;
			}
		}

		public Form1()
		{
			InitializeComponent();
		}

		private void button1_Click(object sender, EventArgs e)
		{
			if (double.TryParse(width.Text, out display_width))
			{
				if (double.TryParse(height.Text, out display_height))
				{
					double side = Math.Sqrt(Math.Pow(display_width / 2, 2) + Math.Pow(display_height, 2));

					double cathet2 = Math.Sqrt(Math.Pow(display_height, 2) + Math.Pow((display_width/2), 2));
					double main = Math.Sqrt(Math.Pow(cathet2, 2) + Math.Pow(display_height, 2));

					pyramidHeight.Text = String.Format("{0:0.00}", display_height);

					A1.Text = String.Format("{0:0.00}", side);
					B1.Text = String.Format("{0:0.00}", main);
					C1.Text = String.Format("{0:0.00}", display_height);
					sideArea.Text = String.Format("{0:0.00}", get_triangle_area(side, main, display_height));

					A2.Text = String.Format("{0:0.00}", main);
					B2.Text = String.Format("{0:0.00}", main);
					C2.Text = String.Format("{0:0.00}", display_width);
					mainArea.Text = String.Format("{0:0.00}", get_triangle_area(main, main, display_width));
				}
			}
			else
			{
				//parsing failed. 
			}
		}
	}
}