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    MsFerguson's Avatar
    MsFerguson Posts: 1, Reputation: 1
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    #1

    Jun 21, 2010, 03:34 PM
    This is a pattern block train. It starts with one triangle and adds one triangle at a time. I need the formula for these but the actual size is unknown. It becomes a four sided figure when the second triangle is added to it. I need the formulas for 1, 2, 3, 4, 5, 12,20,and 100.

    What is the formula for these perimeters
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Jun 21, 2010, 11:37 PM

    Can you give any more details?

    If two similar triangles are to be joined and they form a four sided figure, it means they must be joining at their longest side, in the case they are right-angled isosceles, forming a square.
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