Not a quadrilateral — task. Maths CBSE Live product, Class 8 (2026-27).

Which of the following figures is not a quadrilateral according to the definition provided in the text?

A cyclic quadrilateral where all four vertices sit on a circle's circumference.
A trapezium with two right angles (right-trapezium).
An oblong rectangle where the length is greater than the width.
A shape with three straight sides and one curved side

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