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Math Help - tks isolceles.

  1. #1
    Junior Member
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    tks isolceles.

    If ∠1 ≅∠2, then ΔTKS is isosceles.
    Use the figure below to prove the statement above.

    tks isolceles.-sub9-9.jpg

    I seriously need help with this...
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  2. #2
    Super Member
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    Vertical angles are equal. If 1=2 then 3=4. QED


    bjh
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  3. #3
    Member Veronica1999's Avatar
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    A straight line is 180 degrees.

    Then, angle 1 + T = 180 degrees
    angle 3 + T = 180 degrees

    which makes angle 1 = angle 3


    Then, angle 4 + S = 180 degrees
    angle 2 + S = 180 degress

    which makes angle 4 = angle 2

    if, angle 1 and angle 2 are equal then angle 3 = angle 4

    this makes tks an isosceles triangle
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