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In triangle XYZ, the measure of angle Y is 90°90° and YW¯¯¯¯¯¯𝑌𝑊¯ is an altitude of the triangle. The length of XY¯¯¯¯¯¯𝑋𝑌¯ is 26, and the length of XZ¯¯¯¯¯𝑋𝑍¯ is triple the length of XY¯¯¯¯¯¯𝑋𝑌¯. What is the value of YW¯¯¯¯¯¯YZ¯¯¯¯¯𝑌𝑊¯𝑌𝑍¯?130130eliminate1313eliminate33eliminate2626eliminate

Question

In triangle XYZ, the measure of angle Y is 90°90° and YW¯¯¯¯¯¯𝑌𝑊¯ is an altitude of the triangle. The length of XY¯¯¯¯¯¯𝑋𝑌¯ is 26, and the length of XZ¯¯¯¯¯𝑋𝑍¯ is triple the length of XY¯¯¯¯¯¯𝑋𝑌¯. What is the value of YW¯¯¯¯¯¯YZ¯¯¯¯¯𝑌𝑊¯𝑌𝑍¯?130130eliminate1313eliminate33eliminate2626eliminate

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Solution

Para resolver este problema, sigamos los siguientes pasos:

  1. Identificar las longitudes dadas:

    • La longitud de XY XY es 26.
    • La longitud de XZ XZ es el triple de XY XY , por lo tanto, XZ=3×26=78 XZ = 3 \times 26 = 78 .
  2. Usar el Teorema de Pitágoras: Dado que Y \angle Y es un ángulo recto, el triángulo XYZ XYZ es un triángulo rectángulo con YW YW como la altura desde Y Y a XZ XZ .

  3. Calcular la longitud de YZ YZ : Usamos el Teorema de Pitágoras en el triángulo XYZ XYZ : XZ2=XY2+YZ2 XZ^2 = XY^2 + YZ^2 Sustituyendo los valores conocidos: 782=262+YZ2 78^2 = 26^2 + YZ^2 6084=676+YZ2 6084 = 676 + YZ^2 YZ2=6084676 YZ^2 = 6084 - 676 YZ2=5408 YZ^2 = 5408 YZ=5408 YZ = \sqrt{5408} YZ=21352 YZ = 2\sqrt{1352} YZ=2×2338 YZ = 2 \times 2\sqrt{338} YZ=4338 YZ = 4\sqrt{338}

  4. Calcular la longitud de YW YW : Usamos la fórmula del área de un triángulo rectángulo: Aˊrea=12×XY×YZ=12×XZ×YW \text{Área} = \frac{1}{2} \times XY \times YZ = \frac{1}{2} \times XZ \times YW Sustituyendo los valores conocidos: 12×26×YZ=12×78×YW \frac{1}{2} \times 26 \times YZ = \frac{1}{2} \times 78 \times YW 26×YZ=78×YW 26 \times YZ = 78 \times YW YW=26×YZ78 YW = \frac{26 \times YZ}{78} YW=26×433878 YW = \frac{26 \times 4\sqrt{338}}{78} YW=10433878 YW = \frac{104\sqrt{338}}{78} YW=5233839 YW = \frac{52\sqrt{338}}{39} YW=43383 YW = \frac{4\sqrt{338}}{3}

  5. Calcular la razón YWYZ \frac{YW}{YZ} : YWYZ=433834338 \frac{YW}{YZ} = \frac{\frac{4\sqrt{338}}{3}}{4\sqrt{338}} YWYZ=43383×14338 \frac{YW}{YZ} = \frac{4\sqrt{338}}{3} \times \frac{1}{4\sqrt{338}} YWYZ=13 \frac{YW}{YZ} = \frac{1}{3}

Por lo tanto, la respuesta correcta es YWYZ=13 \frac{YW}{YZ} = \frac{1}{3} .

This problem has been solved

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