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OpenStudy (anonymous):
The region bounded by a quadrilateral must be convex. True False
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OpenStudy (kunal):
true....
OpenStudy (kunal):
sorrry... its false
OpenStudy (kunal):
actually it is rather a guss .. well i am not sure but may be it is because a quadrilateral is curved inwards and that phenomenon is called concavity...
Directrix (directrix):
A quadrilateral may be convex or concave (see the diagram).
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