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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "\n",
+    "# Chapter 2: Chain Surveying"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "\n",
+    "\n",
+    "###   pg-56, pb-1"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "('max length of offset should be', 6.8842279474019135, 'meters')\n"
+     ]
+    }
+   ],
+   "source": [
+    "from __future__ import division\n",
+    "\n",
+    "import math\n",
+    "\n",
+    "ag=5;\n",
+    "giv=0.03;\n",
+    "\n",
+    "L=20;\n",
+    "l=(giv*L/(math.sin(ag*math.pi/180)));\n",
+    "\n",
+    "\n",
+    "AB=l;\n",
+    "\n",
+    "BC=AB*(math.sin(ag*(math.pi/180)));\n",
+    "BC=BC/20;\n",
+    "\n",
+    "print('max length of offset should be',l,'meters');\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "\n",
+    "\n",
+    "### ch-2  page-56, pb-2"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "('required displacement perpendicular to chain is', 0.0020556978681392835, 'meters')\n",
+      "('displacement parallel ot chain is', 0.07850393436441575, 'meters')\n"
+     ]
+    }
+   ],
+   "source": [
+    "from __future__ import division\n",
+    "\n",
+    "import math\n",
+    "\n",
+    "\n",
+    "AD=AB=15;\n",
+    "ag=3;\n",
+    "AC=15*(math.cos(ag*(math.pi/180)))\n",
+    "\n",
+    "CD=AB-AC\n",
+    "sc=10;\n",
+    "\n",
+    "CD=CD/sc;\n",
+    "\n",
+    "print('required displacement perpendicular to chain is',CD,'meters');\n",
+    "\n",
+    "\n",
+    "BC=AB*(math.sin(ag*(math.pi/180)));\n",
+    "\n",
+    "BC=BC/sc;\n",
+    "print('displacement parallel ot chain is',BC,'meters');\n",
+    "\n"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 2",
+   "language": "python",
+   "name": "python2"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 2
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython2",
+   "version": "2.7.11"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}