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Earn +20 ptsQ: Is a rectangle a concave
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Is an arrow concave or convex?
Concave, because you can connect the corners from the outside.
Does a quadrilateral have a convex or a concave angle?
concave
What are the four four-sided objects in geometry?
4-sided polygons include the square, rectangle, and rhombus (all parallelograms), and the trapezoid.*A fifth type is a concave or convex quadrilateral with no equal or parallel sides.
What is a rectilinear figure?
A rectilinear figure is a polygon such that all its sides meet at right angles. The only convex shapes are a rectangle (or square), but it can also be a concave shape with some interior angles of 270 degrees.
Which quadrilaterals have two obtuse angles?
Every parallelogram and most trapezoids have.Oh wait! It seems to me that every quadrilateral, regular or irregular, that'snot a rectangle and not concave, must have at least two obtuse angles.
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