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Question
Δ ABC में, DE || BC है। यदि AD = x, DB = x – 2, AE = x + 2 और EC = x – 1, तो x का मान ज्ञात कीजिए।
Sum
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Solution
In ΔABC, DE || BC
∴ `(AD)/(DB) = (AE)/(EC)` ...(आधारभूत आनुपातिकता प्रमेय (BPT) के द्वारा)
`\implies x/(x - 2) = (x + 2)/(x - 1)`
`\implies` x(x – 1) = (x + 2) (x – 2)
`\implies` x2 – x = x2 – 4
`\implies` –x = –4
`\implies` x = 4
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