It means sunken in. If the top of a stone is concave, it can hold rainwater.
'Convex' means swollen out. If the top of a stone is convex, water rolls off.
That's a point where the curve of a graph changes from "concave upward" to "concave downward", or vice versa.
bent or curved inwards
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That's a point where the curve of a graph changes from "concave upward" to "concave downward", or vice versa.
it is the deeper concave offered by zero skateboards
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.
If an object is concave, it means that is contains a surface that curves inward. Eyeglass lenses and bowls, for example, can both be said to be concave.
Do you mean is a meniscus always concave? If so, then no. For example, the meniscus of mercury is convex.
bent or curved inwards
Once you measure it and do the math you will know. Use algebra. Parabolic curves formulas.
Concave means that there is a dip in the object, like it has caved in. Bi-concave means that it is dipped in on two sides of the object. A good example is a red blood cell. It is a bi-concave disk - it has dips on two sides of it.
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concave
The opposite of convex is concave. Concave shapes have an inward curve, while convex shapes have an outward curve.