Yes, it looks like an arrowhead and is called a concave quadrilateral.
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quadrilaterals are consecutive and opposite angles always congruent?
rhoumbus & trapazoid
a reflex angle is an angle over 180 degrees.
Yes they will have the same angles but with proportional different lengths
A quadrilateral with 0 right angles is a trapezoid, i know it looks like it has right angles IT DOES NOT!