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How can you tell whether a quadrilateral is convex or not convex?
If any of the angles is greater than 180 degrees, the quadrilateral is concave.
What is the largest angle in quadrilateral?
Any angle <360 degrees is possible, though it would be a concave quadrilateral if the angle were greater than 180 deg.
Is a triangle convex or concave?
Three vertices polygons (aka triangle) can not be concave or convex because it doesn't have enough verticies to susustain an internal angle is less than or equal to 180 degrees. * * * * * Actually, a triangle IS a convex polygon. Convexity requires angle to be less than 180 degrees and since the three angles of a triangle sum to 180 degrees, each one of them MUST be less than 180 degrees!
Is it possible to have quadrilateral whose sum of angle measurement is less than 360 degrees?
No because the 4 interior angles of any 4 sided quadrilateral always add up to 360 degrees.
What is a quadrilateral with one interior reflex angle?
a kite or a dart * * * * * Not a kite: all its angles are less than 180 degrees.
