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In the given figure,
∠AGB = ∠AFC (each 90°)
⇒ BG ║ CF ( corresponding angles are equal)
Now,
(i) In Δ ABG and Δ DCB
∠AGB = ∠DBC ( each 90°)
∠ABG ∠BCD (corresponding angles since BG & CF are parallel)
∴ Δ ABG is similar to Δ DCB
⇒ BG/BA = BC/BD (BPT) -------(1)
(ii) Now,
In Δ ABG & Δ ABE
∠ A = ∠ A (common)
∠ABE = ∠AGB (each 90°)
⇒ Δ ABG is similar to Δ ABE
⇒ BG/BA = BE/BA (BPT)
from (1)
⇒ BC/BD = BE/BA (∵ BG/BA = BC/BD = BE/BA)
Hope that this helps you
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