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Concave, because you can connect the corners from the outside.
concave
A concave line is a line that caves in.
No, you would need at least 4 points to create a concave polygon.
A [concave] pentagon.
They're both concave.
The visible portion of the ear is shaped in such a way that it best amplifies sound. A pig's ear is large and concave so that it can trap sound waves and amplify them inside the pig's ear for optimum hearing.
doctors use concave mirror for examination of ear nose throat and eyes because when something is placed between focal length and pole of a concave mirror the doctor sees an enlarged, erect and virtual image of his nose, ears etc..
concave
concave concave
Concave is a property of [irregular] polygons. A parallelogram cannot be concave.
plano concave
no concave mirror is in shape of concave mirror
Concave, because you can connect the corners from the outside.
Concave
concave=in convex=out
There are some meaning on the term " concave up". However, in most cases, a concave is a hallow curve. A half circle with an opening is also a concave. Concave up means to concave somethings.