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anonymous

  • one year ago

The triangle in the diagram represents a mold that Anna uses to shape dough before baking. Anna also has a circular mold whose rim just fits inside the rim of the triangular mold. What is the radius of the circular mold?

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  1. anonymous
    • one year ago
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    |dw:1434401279438:dw|

  2. theEric
    • one year ago
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    Hi! Do you have a formula for this?

  3. theEric
    • one year ago
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    I found one at http://www.efunda.com/math/areas/CircleInscribeTriangleGen.cfm That should help! :)

  4. anonymous
    • one year ago
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    @theEric it still confuses me a bit can you explain it?

  5. theEric
    • one year ago
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    Okay! You need to find \(k\) to fit into the equation. \[k=\frac12(a+b+c)\]where \(a\), \(b\), and \(c\) are the lengths of the sides of your triangle.

  6. theEric
    • one year ago
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    Then you use those sides and \(k\) again in the expression \[\frac{\sqrt{k(k-a)(k-b)(k-c)\ }}{k}\] The value of that expression IS the radius.

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