In the given figure, △ ODC △ OBA . If ∠ BOC = 110° , ∠ ODC = 45° and AB = 2 CD , then find (i) m∠ OAB (ii) OB:OD .

CBSE Class 10 Maths PYQ · Triangles · Similarity with Triangles · 2 Marks · March 2026 · Basic

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1582 Marks · March 2026 · Basic
In the given figure, $\triangle ODC \sim \triangle OBA$. If $\angle BOC = 110\degree$, $\angle ODC = 45\degree$ and $AB = 2 CD$, then find (i) $m\angle OAB$ (ii) $OB:OD$.
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Solution:
(i) $\triangle ODC \sim \triangle OBA$
Getting $m\angle OAB = 65\degree$ (1 Mark)
(ii) $\frac{OD}{OB} = \frac{DC}{BA} = \frac{1}{2}$
$OB:OD = 2:1$ (1 Mark)
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