1. has at least 3 straight sides
2.closed figure
3. forgot the third one
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Parallelogram quadrilateral trapezoid rectangle square
YES!!! The 'quad' prefix means '4'. However, quadrilaterals can have different names , depending on their characteristics. Square Reactangle Rhombus Parallelogram Trapezium Kite
what do yo mean by formulas? Are you asking for the different characteristics of quadrilaterals that make some squares and some rhombuses? There is not really a formula for a quadrilateral.
a rectangle has 4 right angles, a parallelogram has 2 acute angles and 2 obtuse angles
It is an inscribed quadrilateral or cyclic quadrilateral.