//Triangle Area
  function areatriangle() {
    document.triangle.result.value=(1/2)*(document.triangle.base.value)*(document.triangle.height.value);
    document.triangle.measure.value=(document.triangle.unit.value);
  }
  
  //Parallelogram
  function areaparallelogram() {
    document.parallelogram.result.value=(document.parallelogram.base.value)*(document.parallelogram.height.value);
    document.parallelogram.measure.value=(document.parallelogram.unit.value);
  }
  
  //Rombus
  function arearhombus() {
    document.rhombus.result.value=(1/2) * ((document.rhombus.d1.value)*(document.rhombus.d2.value));
    document.rhombus.measure.value=(document.rhombus.unit.value);
  }

  //Trapezium
  function areatrapezium() {
    document.trapezium.result.value=(1/2) * (parseInt(document.trapezium.s1.value) + parseInt(document.trapezium.s2.value))*(document.trapezium.height.value);
    document.trapezium.measure.value=(document.trapezium.unit.value);
  }

  //Circle
  function areacircle() {
    document.circle.result.value= (Math.PI * (document.circle.radius.value)*(document.circle.radius.value)).toPrecision(6);
    document.circle.measure.value=(document.circle.unit.value);
  }
  
  //Sector
  function areasector() {
    document.sector.result.value=((Math.PI * (document.sector.radius.value)* (document.sector.radius.value) *(document.sector.angle.value)) / 360).toPrecision(6);
    document.sector.measure.value=(document.sector.unit.value);
  }
  
  //Elipse
  function areaellipse() {
    document.ellipse.result.value=((Math.PI*(document.ellipse.major.value)*(document.ellipse.minor.value)) / 4).toPrecision(6);
    document.ellipse.measure.value=(document.ellipse.unit.value);
  }
  
  //Cylinder
  function areacylinder() {
    document.cylinder.result.value=(2 * Math.PI*(document.cylinder.radius.value)*(parseInt(document.cylinder.radius.value) + parseInt(document.cylinder.height.value))).toPrecision(6);
    document.cylinder.measure.value=(document.cylinder.unit.value);
  }
  
  //Sphere
  function areasphere() {
    document.sphere.result.value=(4 * Math.PI * (document.sphere.radius.value)* (document.sphere.radius.value)).toPrecision(6);
    document.sphere.measure.value=(document.sphere.unit.value);
  }
  
  //Prism
  function areaprism() {
    document.prism.result.value=(2 * (document.prism.length.value)* (document.prism.width.value)) + parseInt(2 * (parseInt(document.prism.length.value) + parseInt(document.prism.width.value)) * (document.prism.height.value));
    document.prism.measure.value=(document.prism.unit.value);
  }
  
  //Cone
  function areacone() {
    var r1 = ((document.cone.radius.value) * (document.cone.radius.value));
    var r2 =  ((document.cone.height.value) * (document.cone.height.value));
    var r3 = parseInt(r2) + parseInt(r1);
    document.cone.result.value= (Math.PI * (document.cone.radius.value)* Math.sqrt(r3)).toPrecision(6);
    document.cone.measure.value=(document.cone.unit.value);
  }