Question

Develop a VB.Net application that gets input from the user about the radius of a circle, calculates the diameter, circumference, and area of the circle, and displays
the results in three textboxes. The three textboxes should be disabled for user input. A logic flow and the form that implements the flow are required for this
problem.

Answer 1

Main code

Public Class Form1

Private Sub btnCalculate_Click(sender As Object, e As EventArgs) Handles btnCalculate.Click
Dim r, area, cir, dia As Double ''variable hold the radius entered by the user
r = Val(txtRadius.Text)
dia = 2 * r
cir = 2 * Math.PI * r
area = Math.PI * r * r
txtArea.Text = Math.Round(area, 2).ToString()
txtCircumference.Text = Math.Round(cir, 2).ToString()
txtDiameter.Text = Math.Round(dia, 2).ToString()
End Sub
End Class

design

output

If you have any query regarding the code please ask me in the comment i am here for help you. Please do not direct thumbs down just ask if you have any query. And if you like my work then please appreciates with up vote. Thank You.