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

  1. A segment, labeled 28 mm, is divided into 2 sections, labeled as follows: 11 mm, and question mark.

    How long is the entire length?
    Which part is mm?
    Try to answer the question with these things in mind.

    How long is the unknown length?

    mm, because .

  1. A segment, labeled with a question mark, is divided into 3 sections, labeled as follows: 5 mm, 12 mm, and 13 mm. The first two sections are bracketed and labeled with a question mark.

    How long is the shorter unknown length?

    The problem segments, with the label, 5 + 12, on the bracket, for the first 2 sections.

    The shorter length is mm. Explain why on your paper.

    Now use the same method to find the entire length.