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17 June, 12:23

Ms. Warren had each student take 3 pencils and create a triangle with them. Roberto has 3 pencils that measure 12 cm, 5 cm, and 7 cm. How many triangles can Roberto create with his 3 pencils?

A. infinitely many

B. two

C. one

D. none

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Answers (2)
  1. 17 June, 12:28
    0
    D. None.

    Step-by-step explanation:

    The Triangle Inequality Theorem states the longest side must be shorter than the sum of the other 2 sides. The longest side (12) > = (7 plus 5) = 12 is too large.
  2. 17 June, 12:48
    0
    One.

    Step-by-step explanation:

    The reason why is because 12-5 = 7, meaning that your lowest length has to be 7. meaning, that you can only do one triangle.
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