Looking from the base your would see a circle.
Looking from the side you would see a triangle.
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It would look similar to an isosceles triangle.
A 2D cone is often referred to as a "conic section." In mathematics, a conic section is a curve obtained by intersecting a cone with a plane. The different types of conic sections include circles, ellipses, parabolas, and hyperbolas, each with unique properties and equations.
A Circle if you mean 2d circle, 3d sphere =P Any continuously curves shape has no sides; ellipse (ellipsoid), cone, hyperbolic paraboloid...
A rhombus is a 2D shape.
The answer is zero. A 2D shape has no volume.