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Two plane figures are said to be congruent if they have

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In the isosceles ∆XYZ, given XY = YZ then which of the following angles are equal?

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In Δ ABC and ∆DEF, ∠B = ∠E, AB = DE, BC = EF. The two triangles are congruent under _____ axiom

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In a triangle ABC, ∠A = 40^o and AB = AC, then ABC is _____ triangle.

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In the triangle ABC, when ∠A = 90^o the hypotenuse is ______