in a figure angle acb =angle cba,ac=8cm and ad=3cm,find bd
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Answer:
As ∠CDA=90
o
⇒∠ACB=90
o
In ΔACD,cosA=
AC
AD
=
8
3
In ΔABC,cosθ=
AB
AC
⇒
8
3
=
AB
3
AB=8cm
⇒BD=8−3
=5cm.
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