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In the diagram above, \(\overline{MN} || \overline{KL}\), \(\overline{ML}\) and \(\overline{KN}\) intersect at X. |\(\overline{MN}\)| = 12cm, |\(\overline{MX}\)|...

Mathematics
WAEC 2024

In the diagram above, \(\overline{MN} || \overline{KL}\), \(\overline{ML}\) and \(\overline{KN}\) intersect at X. |\(\overline{MN}\)| = 12cm, |\(\overline{MX}\)| = 10cm and |\(\overline{MN}\)| = 9cm. If the area of \(\triangle\) MXN is 16cm\(^2\), calculate the area of \(\triangle\) LXK

  • A. 9cm\(^2\)
  • B. 8cm\(^2\)
  • C. 10cm\(^2\)
  • D. 12cm\(^2\)
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Correct Answer: Option A
Explanation

\(\overline{MN} || \overline{KL}\), \(\triangle\) LXK is similar to \(\triangle\)MXN

So, the ratio of the areas of the two similar triangles equals the square of the ratio of their corresponding sides

Therefore, \(\frac{ Area of \triangle MXN}{Area of \triangle LXK} = \frac{12^2}{9^2}\)

\(\frac{16}{Area of \triangle LXK} = \frac{144}{81}\)

Area of \(\triangle\)LXK =  \(\frac{ 16 \times 81}{144} = 9cm^2\)


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