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Triangles — Maths STD 9 — Question

CBSE BoardEnglish MediumSTD 9MathsTriangles4 Marks
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Answer

Given,
$\angle\text{B}<\angle\text{A}$ and $\angle\text{C}<\angle\text{D}$ 
Now,
AO < BO ...(i) (Side opposite to the smaller angle is smaller)
OD < OC ...(ii) (Side opposite to the smaller angle is smaller)
Adding (i) and (ii),
AO + OD < BO + OC
AD < BC.

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