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Delta ABC is an isosceles triangle in w...

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