In the given figure ∠ ADE = ∠ ACB and AD/DB = AE/EC . Prove that ABC is an isosceles triangle.

CBSE Class 10 Maths PYQ · Triangles · BPT & Converse · 2 Marks · March 2025 · Basic

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442 Marks · March 2025 · Basic
In the given figure $\angle ADE = \angle ACB$ and $\frac{AD}{DB} = \frac{AE}{EC}$. Prove that $\Delta ABC$ is an isosceles triangle.
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Solution: Since $\frac{AD}{DB} = \frac{AE}{EC}$ therefore $DE \parallel BC$ (By converse of BPT) [1/2 mark]
$\Rightarrow \angle ADE = \angle ABC$ (corresponding angles) [1/2 mark]
given $\angle ADE = \angle ACB$ therefore $\angle ABC = \angle ACB$ [1/2 mark]
$\Rightarrow AC = AB$ or $\Delta ABC$ is an isosceles triangle. [1/2 mark]
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