a figure or shape that curves in not out
No.
h
B and C
mirror with a concave parabolic figure
It is a concave figure, which can only be formed in figures with four or more lines (quadrilaterals and above).
An image does not produce an image. However, a concave mirror, specifically one witha parabolic figure, forms an image in its focal plane of an infinitely distant object.
A concave octagon has is an 8-sdided figure in which one or more vertices (interior angles) are more than 180° , producing a shape with an inward bow, or a concavity (think of a cave).
A triangle (or other polygon) on a concave surface (such as the inside of a sphere), possibly.
the boards concave if you are looking for the sole purpose of going fast such as bombing hills concave is not very needed
A polygon is a closed figure made of line segments. Therefore, a chevron is a polygon, specifically one that is concave.
It could be a triangle, a quadrilateral, a pentagon, a hexagon or even an octagon if they are two concave quadrilaterals.
The opposite of convex is concave. Concave shapes have an inward curve, while convex shapes have an outward curve.