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britbrat4601

  • 2 years ago

Which three lengths could be the lengths of the sides of a triangle? A. 12 cm, 5 cm, 17 cm B. 10 cm, 15 cm, 24 cm C. 9 cm, 22 cm, 11 cm D. 21 cm, 7 cm, 6 cm

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  1. geoffb
    • 2 years ago
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    Remember that the sum of the two shorter legs have to be greater than the longest leg. If they sum to less, they can't even touch. If they sum to the same, they are on the same line as the long leg, and it is not a triangle.

  2. britbrat4601
    • 2 years ago
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    so b?

  3. geoffb
    • 2 years ago
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    Yes.

  4. britbrat4601
    • 2 years ago
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    thanks for your help!

  5. geoffb
    • 2 years ago
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    A would just be a line, and C and D could not connect to form a triangle.

  6. geoffb
    • 2 years ago
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    No problem. :)

  7. vitorfleite
    • 2 years ago
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    Everyone can be a triangle, scalene triangles.

  8. geoffb
    • 2 years ago
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    @vitorfleite No they can't. Draw them out on a piece of paper and you'll see.

  9. vitorfleite
    • 2 years ago
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    I draw a triangle with the lenghts of C, now.

  10. geoffb
    • 2 years ago
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    |dw:1353900288402:dw| You can't make the 12 and 5 cm lines into a triangle. The only way they can connect is as a straight line.

  11. geoffb
    • 2 years ago
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    |dw:1353900366005:dw| The two shorter lines cannot connect.

  12. geoffb
    • 2 years ago
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    In C and D, the shorter lines don't even add up to the big line. It's not mathematically possible for two short lines to create a triangle with a long line unless the two short lines sum to greater than the long line.

  13. vitorfleite
    • 2 years ago
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    I understood now, I did wronggg.

  14. geoffb
    • 2 years ago
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    No worries. I made the exact same false assumption on here a few months ago. :)

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