A triangle ABC has been enlarged by scale factor m= 2.5 to the triangle A' B' C'. Calculate the length of C' A' if CA=4 cm.

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Solution

The correct option is A 10
$△ A B C$ is enlarged to $△ A^{'} B^{'} C^{'}$ ,
Thus, $\frac{C^{'} A^{'}}{C A} = 2.5$
Therefore, $\frac{C^{'} A^{'}}{4} = 2.5$
$\Rightarrow C^{'} A^{'} = 4 \times 2.5$
$\Rightarrow C^{'} A^{'} = 10$ cm

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A triangle ABC has been enlarged by scale factor k = 2.5 to the triangle A' B' C'.

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