A sphere has a total curved surface.
A cylinder and a cone have a partial curved surface
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geometric
Geometric abstraction is a form of abstract art based on the use of geometric forms sometimes, though not always, placed in non-illusionistic space and combined into non-objective compositions.
It is a curved line that forms part of the circumference of a circle.
cubist
a rectangle
The radius of the sphere of which a lens surface or curved mirror forms a part is called the radius of curvature.
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The meniscus is the name for the way that water forms a concave curve at it's surface. This is because of the cohesive and capillary properties of water.
Egyptians excelled in many geometric forms, including squares, triangles (pyramids), and spheres.
I disagree with the post from earlier: No, only geometric. Organic means natural, not artificially improved or created. if it brought you to this when u were asking about forms not shapes the answer is not only geometric -- At least as far as art goes the following is true: Shapes can be organic, geometric or irregular. At least from the stand point of an artist.
Geometric means (1) "relating to geometry" or (2) "having simple geometric forms such as circles and squares in design or decoration."
it can form both ..
A circle.
Trapezus
Yes forms usually are either organic or geometric. Organic shapes resemble shapes usually met in nature; the gentle curve of a tree branch, the floral or a rock for example. Geometric shapes are easy to draw and measure with rulers and other devices. Usual geometric shapes are symmetric like circle, square, triangle, cross... for example. Geometric shapes can also be asymmetric.
Forms can be either geometric or organic.