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According to the diagrams below, how long is each unknown piece?

  1. How long is the entire length?

    Which part is 11mm?

    Try to answer the question with these things in mind.

    11 + ? = 28

    How long is the unknown length?

    17mm, because 11 + 17 = 28.

  1. How long is the shorter unknown length?

    The shorter length is 17mm.

    Explain why on your paper.

    Now use the same method to find the entire length.