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ABC is an isosceles triangle in which ...

ABC is an isosceles triangle in which `A B""=" "A C` . Side BA is produced to D such that `A D" "=" "A B` (see Fig. 7.34). Show that `/_B C D` is a right angle.

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`(##IX_07_E02_06_s01##)`
In isosceles triangle ABC, `AB = AC` (Given)
`∴ ∠ACB = ∠ABC` (Angles opposite to equal sides of a triangle are equal)
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