Pythagorean Theorem

This a program that can solve geometric problems based on Pythagorean Theorem. We suppose everybody is already familiar with the above Theorem. However, some of your kids may not have learned this theorem yet. So, let us list the formula here. By referring to a right angled triangle ABC, if the sides are AB, AC and AC respectively, where AC is the hypotenuse, then AB, AC and BC are connected by the formula AB²+AC²=BC²

Using the above formula, you can calculate the third side if the the length of any two sides are know. For example, if AB=4 and AC=3 then BC=5. We have designed the VB program for the user to input any two sides and then he or she is able to calculate the third side automatically. The third side BC can be found by finding the square root of AB²+AC² . In visual basic, the syntax is

BC= Sqr(AB ^ 2 + AC ^ 2)

We can also the function Round to round the value to two decimal places using the syntax Round(BC, 2).

The Interface

The Code
Private Sub Command1_Click()
Dim AB, AC, BC As Single
AB = Val(Txt_AB.Text)
AC = Val(Txt_AC.Text)
BC = Val(Txt_BC.Text)
If AB <> 0 And AC <> 0 Then
BC = Sqr(AB ^ 2 + AC ^ 2)
Txt_BC.Text = Round(BC, 2)
ElseIf AB <> 0 And BC <> 0 Then
AC = Sqr(BC ^ 2 - AB ^ 2)
Txt_AC.Text = Round(AC, 2)
ElseIf AC <> 0 And BC <> 0 Then
AB = Sqr(BC ^ 2 - AC ^ 2)
Txt_AB.Text = Round(AB, 2)
End If
End Sub

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