Open the Area Solution (Area Solution.sln) file contained in the ClearlyVB2012Chap26 Area Solution folder. If necessary, open the designer window.
a. Use the PROJECT menu to add a new class file named Square.vb to the project. The Square class should have one attribute: a side measurement (which may contain a decimal place). It also should have two behaviors: a default constructor and a function that calculates and returns the area of the square. Code the Square class. Save the solution and then close the Square.vb window.
b. Open the formâ€™s Code Editor window. Use the comments entered in the btnCalc_Click procedure to code the procedure.
c. Save the solution and then start and test the application. Close the Code Editor window and then close the solution. (See Appendix B for the answer.)