**:-**The area of a rectangle is equal to the number of unit squares that can be fit between the boundaries the rectangle.

Area = a

a = length of side

^{2}a = length of side

**SOURCE CODE :-**

`using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace area { class rectangle { public void are() { double l_rectangle, b_rectangle; double a_rectangle; double sides; double a_square; Console.WriteLine("enter the value of lenght and bredth of rectangle "); l_rectangle =double.Parse(Console.ReadLine()); b_rectangle =double.Parse(Console.ReadLine()); a_rectangle = l_rectangle * b_rectangle; Console.WriteLine("the area of rect is=" + a_rectangle); Console.WriteLine("Enter the sides of the square"); sides = double.Parse(Console.ReadLine()); a_square=sides*sides; Console.WriteLine("the area of square is=" + a_square); } } class program { static void Main(string[] args) { rectangle b = new rectangle(); b.are(); } } }`

**Output:-**

`enter the value of lenght and bredth of rectangle 4 4 the area of rect is =16 Enter the sides of the square 5 The area of square is =25`

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