When symptoms occur, they often develop gradually, and may include: 1  Cough. 2  Fatigue, exhaustion, and light-headedness. 3  Rapid breathing.  Sensation of feeling the heart beat (palpitations) or a rapid 1  heartbeat. Shortness of breath that increases with activity and when lying down.
Yes, because a square is just a rhombus where the angles are all right angles. It is more common to call this shape a rhombus, but some people call it a rhomb or even a diamond.
Not every parallelogram is a rhombus, though any parallelogram with perpendicular diagonals (the second property) is a rhombus. In general, any quadrilateral with perpendicular diagonals, one of which is a line of symmetry, is a kite. Every rhombus is a kite, and any quadrilateral that is both a kite and parallelogram is a rhombus. A rhombus is a tangential quadrilateral. That is, it has an inscribed circle that is tangent to all four sides.