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Okay I have a problem I can't figure out. I have having to write a program that you input three numbers and the program tells you if it is Right triangle or not. I can't figure out the function that figures the three numbers. Can someone please help me.


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  • FazFaz Member Posts: 75
    : Okay I have a problem I can't figure out. I have having to write a program that you input three numbers and the program tells you if it is Right triangle or not. I can't figure out the function that figures the three numbers. Can someone please help me.
    :
    :
    :
    For a start, you'll actually need 6 numbers, an x and y co-ordinate for each point. If you assume a is where the right angle is, you can say if b has the same x value and c has the same y value, or if c has the same x value and a has the same y value, it is right angled. Do the same thing if b is the right angle and if c is:

    ax = 10
    ay = 20
    bx = 5
    by = 20
    cx = 10
    dy = 30

    If ax = bx Then
    If ay = cy Then
    ans = True
    End If
    ElseIf ax = cx Then
    If ay = by Then
    ans = True
    End If
    ElseIf bx = ax Then
    If by = cy Then
    ans = True
    End If
    ElseIf bx = cx Then
    If by = ay Then
    ans = True
    End If
    ElseIf cx = ax Then
    If cy = by Then
    ans = True
    End If
    ElseIf cx = bx Then
    If cy = ay Then
    ans = True
    End If
    Else
    ans = False
    End If

    ans is True if it is a right angled triangle.
    Though this code only works if the right angle is laying parallel to the x or y axis!

    To actually get it to work in general, simply compare the gradients of every pair of sides to the triangle. If the product of any pair = -1 then the lines of the gradients are set to bi-sect where the right angle is, this is a proof for determining a right angle triangle.
  • BarkeeperBarkeeper Member Posts: 335
    : : Okay I have a problem I can't figure out. I have having to write a program that you input three numbers and the program tells you if it is Right triangle or not. I can't figure out the function that figures the three numbers. Can someone please help me.
    : :
    : :
    : :
    : For a start, you'll actually need 6 numbers, an x and y co-ordinate for each point. If you assume a is where the right angle is, you can say if b has the same x value and c has the same y value, or if c has the same x value and a has the same y value, it is right angled. Do the same thing if b is the right angle and if c is:
    :
    : ax = 10
    : ay = 20
    : bx = 5
    : by = 20
    : cx = 10
    : dy = 30
    :
    : If ax = bx Then
    : If ay = cy Then
    : ans = True
    : End If
    : ElseIf ax = cx Then
    : If ay = by Then
    : ans = True
    : End If
    : ElseIf bx = ax Then
    : If by = cy Then
    : ans = True
    : End If
    : ElseIf bx = cx Then
    : If by = ay Then
    : ans = True
    : End If
    : ElseIf cx = ax Then
    : If cy = by Then
    : ans = True
    : End If
    : ElseIf cx = bx Then
    : If cy = ay Then
    : ans = True
    : End If
    : Else
    : ans = False
    : End If
    :
    : ans is True if it is a right angled triangle.
    : Though this code only works if the right angle is laying parallel to the x or y axis!
    :
    : To actually get it to work in general, simply compare the gradients of every pair of sides to the triangle. If the product of any pair = -1 then the lines of the gradients are set to bi-sect where the right angle is, this is a proof for determining a right angle triangle.
    :

    ??????
    Ever heard of "Phytagoras"?

    a + b = c sounds familiar?

    If you just want to find out, if a triangle is right-angled, then you just have to check the above equation for all three possibilities (assuming a, b and c are the sides (Not the corners!) of your triangle. You have to calculate the length of each side through the x,y-Values of your corners, which is normal algebra).

    if ((a + b = c) or (a + c = b) or (b + c = a))=False then
    'I'm not a right-angled triangle
    Else
    'Yes, i'm a right-angled triangle
    End if
    ------------------------------------------
    Only stupidity of mankind and the universe
    are infinite, but i'm not sure concerning
    the universe. A. Einstein

  • DrMartenDrMarten Member Posts: 748
    : : : Okay I have a problem I can't figure out. I have having to write a program that you input three numbers and the program tells you if it is Right triangle or not. I can't figure out the function that figures the three numbers. Can someone please help me.
    : : :
    : : :
    : : :
    : : For a start, you'll actually need 6 numbers, an x and y co-ordinate for each point. If you assume a is where the right angle is, you can say if b has the same x value and c has the same y value, or if c has the same x value and a has the same y value, it is right angled. Do the same thing if b is the right angle and if c is:
    : :
    : : ax = 10
    : : ay = 20
    : : bx = 5
    : : by = 20
    : : cx = 10
    : : dy = 30
    : :
    : : If ax = bx Then
    : : If ay = cy Then
    : : ans = True
    : : End If
    : : ElseIf ax = cx Then
    : : If ay = by Then
    : : ans = True
    : : End If
    : : ElseIf bx = ax Then
    : : If by = cy Then
    : : ans = True
    : : End If
    : : ElseIf bx = cx Then
    : : If by = ay Then
    : : ans = True
    : : End If
    : : ElseIf cx = ax Then
    : : If cy = by Then
    : : ans = True
    : : End If
    : : ElseIf cx = bx Then
    : : If cy = ay Then
    : : ans = True
    : : End If
    : : Else
    : : ans = False
    : : End If
    : :
    : : ans is True if it is a right angled triangle.
    : : Though this code only works if the right angle is laying parallel to the x or y axis!
    : :
    : : To actually get it to work in general, simply compare the gradients of every pair of sides to the triangle. If the product of any pair = -1 then the lines of the gradients are set to bi-sect where the right angle is, this is a proof for determining a right angle triangle.
    : :
    :
    : ??????
    : Ever heard of "Phytagoras"?
    :
    : a + b = c sounds familiar?
    :
    : If you just want to find out, if a triangle is right-angled, then you just have to check the above equation for all three possibilities (assuming a, b and c are the sides (Not the corners!) of your triangle. You have to calculate the length of each side through the x,y-Values of your corners, which is normal algebra).
    :
    [code]
    if ((a^2 + b^2 = c^2) or (a^2 + c^2 = b^2) or (b^2 + c^2 = a^2))=False then
    'I'm not a right-angled triangle
    Else
    'Yes, i'm a right-angled triangle
    End if
    [/code]

    Although
    a^2 is less accurate in VB or VB.Net than a*a

    Regards,

    Dr M.



  • Rapidfire220Rapidfire220 Member Posts: 1
    [b][red]This message was edited by Rapidfire220 at 2007-3-12 15:52:40[/red][/b][hr]

    [green] I can help you with your problem, lets break it into 3 steps.

    1. Define the data types [/green]
    [blue] Dim ShortSide, MediumSide, LongSide As String [/blue]

    [green] 2. Ask the user for the variable values [/green]
    [blue] ShortSide = InputBox("Enter The Short Side Length")
    MediumSide = InputBox("Enter The Medium Side Length")
    LongSide = InputBox("Enter The Long Side Length") [/blue]

    [green] 3. Check whether the triangle is right angled and display result
    [blue] If LongSide ^ 2 = ShortSide ^ 2 + MediumSide ^ 2 Then
    MsgBox ("This triangle is right angled")
    Else
    MsgBox ("This triangle is not right angled")
    End If [/blue]

    Hope this helps you, any questions just ask me.














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