3*pi*r2
A cylinder or a cone. Or a hemisphere.
curve surface area
A Semi-Sphere :)
The solid figure you're describing is a cylinder. It has two circular bases, but if we consider a cylinder without its bases, it consists of a single curved surface wrapping around the height of the cylinder. Another example of a solid figure with one curved surface and no bases is a cone if we only consider the curved part without the base.
Cylinder - a solid figure formed by two congruent parallel circles joined by a curved surface.
A cylinder or a cone. Or a hemisphere.
It is a cylinder
One if it is solid, two if it is hollow
curve surface area
A Semi-Sphere :)
Circle
The solid figure you're describing is a cylinder. It has two circular bases, but if we consider a cylinder without its bases, it consists of a single curved surface wrapping around the height of the cylinder. Another example of a solid figure with one curved surface and no bases is a cone if we only consider the curved part without the base.
cone
One if it is solid, two if it is hollow
Cylinder - a solid figure formed by two congruent parallel circles joined by a curved surface.
That sounds like a cone. One surface is a circle and the other surface is curved.
The surface area of a polyhedron can be calculated by first calculating the area of each of its polygonal surfaces and adding these together.The surface area of some curved solids (sphere, cylinder, cone) can be calculated from formula but for most curved solids are more complicated and require integration.