<Li> Tangential trapezoid: a trapezoid where the four sides are tangents to an inscribed circle . </Li> <Li> Cyclic quadrilateral: the four vertices lie on a circumscribed circle . A convex quadrilateral is cyclic if and only if opposite angles sum to 180 ° . </Li> <Li> Right kite: a kite with two opposite right angles . It is a type of cyclic quadrilateral . </Li> <Li> Bicentric quadrilateral: it is both tangential and cyclic . </Li>

What do you mean by a convex quadrilateral