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Question

In ΔABC, AC = 15 cm and DE || BC. If ABAD=3, then the length of EC is :


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Solution

Given: DE BC
From basic proportionality theorem;

ADDB=AEEC

Now, ABAD=AD + DBAD=1+DBAD1+DBAD=3DBAD=2ADDB=AEEC=122AE=ECAC=AE+EC(1)
On substituting value of EC in (1), we get
15=3AE5=AEEC=10 cm

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