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Earn +20 ptsQ: Does a quadrilateral have a convex or a concave angle?
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What is non convex quadrilateral?
A concave quadrilateral. An arrowhead or a delta, for example.
Is a quadrilateral convex or concave?
A normal 2-D quadrilateral would be neither convex or concave. There are three-dimensional quadrilaterals, such as prisms, but it would depend on the shape.
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.
A square is an example of a quadrilateral that is both a regular concave polygon and a regular convex polygon?
No. There can be no regular concave polygon.
Is an acute angle a concave or convex angle?
All angles < 180 degrees are concave. An acute angle is < 90 degrees. So, all acute angles are concave.
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