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Given the triangle XYZ above, calculate the value of Cot \(\theta\) and the length XY,...

Mathematics
JAMB 2025

Given the triangle XYZ above, calculate the value of Cot \(\theta\) and the length XY, respectively

  • A. \(\frac{\sqrt{48}}{13}\), \(\sqrt{48}\)
  • B. \(\frac{\sqrt{48}}{11}\), \(\sqrt{48}\)
  • C. \(\frac{\sqrt{13}}{11}\), \(\sqrt{13}\)
  • D. \(\frac{13}{\sqrt{48}}\), \(\sqrt{48}\)
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Correct Answer: Option B
Explanation

The triangle XYZ is a right-angled triangle at Y, with opposite side to θ (YZ) = 11 cm and hypotenuse (XZ) = 13 cm.

The length of XY = \(\sqrt{(13^2 - 11^2)}\) = \(\sqrt{(169 - 121)}\) = \(\sqrt{48}\) cm (or 4\(\sqrt{3}\) cm in simplified form).

Cot θ = \(\frac{\text{adjacent}}{\text{opposite}}\) = \(\frac{\text{XY}}{\text{YZ}}\) = \(\frac{\sqrt{48}}{11}\)

There is an explanation video available below.


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Explanation Video

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