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प्रश्न
If ∆ABC ~ ∆PQR, A (∆ABC) = 80, A (∆PQR) = 125, then fill in the blanks. \[\frac{A\left( ∆ ABC \right)}{A\left( ∆ . . . . \right)} = \frac{80}{125} \therefore \frac{AB}{PQ} = \frac{......}{......}\]
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उत्तर
Given:
∆ABC ~ ∆PQR
A (∆ABC) = 80
A (∆PQR) = 125
According to theorem of areas of similar triangles "When two triangles are similar, the ratio of areas of those triangles is equal to the ratio of the squares of their corresponding sides".
\[\therefore \frac{A\left( ∆ ABC \right)}{A\left( ∆ PQR \right)} = \frac{{AB}^2}{{PQ}^2}\]
\[ \Rightarrow \frac{80}{125} = \frac{{AB}^2}{{PQ}^2}\]
\[ \Rightarrow \frac{16}{25} = \frac{{AB}^2}{{PQ}^2}\]
\[\Rightarrow \frac{4^2}{5^2} = \frac{{AB}^2}{{PQ}^2}\]
\[ \Rightarrow \frac{AB}{PQ} = \frac{4}{5}\]
Therefore,
\[\frac{A\left( ∆ ABC \right)}{A\left( ∆ PQR \right)} = \frac{80}{125} and \frac{AB}{PQ} = \frac{4}{5}\]
