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Yumira

  • 2 years ago

Given: ΔABC ≅ ΔFDE What is the length of Segment line DE rounded to the nearest tenth? 5.8 4.2 2.2 3.6

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  1. Yumira
    • 2 years ago
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  2. mathstudent55
    • 2 years ago
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    Do you know the distance formula?

  3. Yumira
    • 2 years ago
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    No ._.

  4. mathstudent55
    • 2 years ago
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    For two points, (x1,y1) and (x2,y2) the distance between them is: d = sqrt((x2 - x1)^2 + (y2 - y1)^2) That looks confusing. This looks easier to understand:|dw:1355170387441:dw|

  5. mathstudent55
    • 2 years ago
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    In other words, take the difference between the x values of the two points and square it. Then take the difference between the y values of the two points and square that too. Then add those two squares together and take the square root.

  6. mathstudent55
    • 2 years ago
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    Now look at what you're asked for: the length of DE. Since you know the triangles are congruent, which side in the first triangle corresponds to side DE?

  7. Yumira
    • 2 years ago
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    Thanks (:

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