Higher Study | Arithmetic Ability | Triangles

Which of the set of three sides can't form a triangle?
A point D is taken on the side BC of a right-angled triangle ABC, where AB is hypotenuse. Then
In ΔABC and ΔDEF, AB = DE and BC = EF, then one can infer that ΔABC ≅ ΔDEF, when
If angle bisector of a triangle bisects the opposite side, then what type of triangle is it?
The orthocenter of a triangle is the point where?
In the following figure which of the following statements is true?
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