Question

This is Java
0) Create a project called Lab2-Areas
1) Create a java class called Areas (do not include the main method in this class)
2) Create a method for the following:
- areaCircle
- areaSquare
- areaTriangle
- areaRectangle
- areaTrapezoid
3) Create another class called CalculateAreas
4) Have the main method in this class. Instantiate/Construct the Area object
5) Initialize variables for the appropriate sides (base, height, etc.)
6) Initialize variables for the 5 areas from the Area class
7) print out the 5 area

Answer 1

class Area
{
//data member
double r;
double s;
double l;
double b;
double a;
double h;
double aa;
double bb;
double cc;
double at;
double bt;
double ht;
  
//set method
public void setCircle(double rad)
{
r = rad;
}
  
//set method
public void setSquare(double side)
{
s = side;
}
  
//set method
public void setTriangle(double aa1, double bb1, double cc1)
{
aa = aa1;
bb = bb1;
cc = cc1;
}
  
//set method
public void setRectangle(double length, double bredth)
{
l = length;
b = bredth;
}
  
//set method
public void setTrapezoid(double at1, double bt1, double ht1)
{
at = at1;
bt = bt1;
ht = ht1;
}
  
//metho to calulate area of circle
public double areaCircle()
{
return 22 / 7.0 * r * r;
}
  
//metho to calulate area of square
public double areaSquare()
{
return s * s;
}
  
//metho to calulate area of triangle
public double areaTriangle()
{   
double s = (aa+bb+cc)/2;
return Math.sqrt(s*(s-aa)*(s-bb)*(s-cc));
}
  
//metho to calulate area of rectangle
public double areaRectangle()
{
return l * b;
}
  
//metho to calulate area of trapezoid
public double areaTrapezoid()
{
return (at+bt) * ht / 2;
}
}
public class CalculateAreas
{
   public static void main(String[] args)
   {
   //create object
   Area a = new Area();
  
   //set value
   a.setCircle(4);
   a.setSquare(4);
   a.setTriangle(5, 4, 3);
   a.setRectangle(2, 4);
   a.setTrapezoid(2, 4, 6);
  
   //display the result
       System.out.println("Area of circle is = " + a.areaCircle());
       System.out.println("Area of square is = " + a.areaSquare());
       System.out.println("Area of triangle is = " + a.areaTriangle());
       System.out.println("Area of rectangle is = " + a.areaRectangle());
       System.out.println("Area of trapezoid is = " + a.areaTrapezoid());
   }
}

OUTPUT: