Two similar triangles of ΔXYZ and ΔLMN. If area of (ΔXYZ) = 16 cm2, area of (ΔLMN) = 25 cm2 and YZ = 2.4 cm, then the measure of MN is:

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  1. 3 cm
  2. 1 cm
  3. 4 cm
  4. 2 cm

Answer (Detailed Solution Below)

Option 1 : 3 cm
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Detailed Solution

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Given:

Area of ΔXYZ = 16 cm2

Area of ΔLMN = 25 cm2

YZ = 2.4 cm

Formula Used:

\( \frac{\text{Area of ΔXYZ}}{\text{Area of ΔLMN}} = \left( \frac{\text{YZ}}{\text{MN}} \right)^2\)

Calculation:

\(\frac{16}{25} = \left( \frac{2.4}{\text{MN}} \right)^2\)

⇒ \(\sqrt{\frac{16}{25}} = \frac{2.4}{\text{MN}}\)

⇒ \( \frac{4}{5} = \frac{2.4}{\text{MN}}\)

⇒ \( \text{MN} = \frac{2.4 \times 5}{4}\)

⇒ MN = 3 cm

Therefore, the measure of MN is 3 cm.

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