Surface Area And Volume (Chapter 12): Class 9 IX Maths CBSE

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Surface Area and Volume (Chapter 12): Class 9 IX Maths CBSE

Cube: In geometry, a cube is a three-dimensional solid object bounded by six square faces, facet or sides, with three meetings at each vertex.
Cuboid: A cuboid is a three-dimensional shape with a length, width, and height. The cuboid shape has six faces just like rectangle, and all the corners are at 90 degrees.
Cylinder: A cylinder is a solid object with two identical flat ends that are circular or elliptical and one curved side. It has the same cross-section from one end to the other.
Cone: A cone is a solid that has a circular base and a single vertex. If the vertex is over the center of the base, it is called a right cone. If it is not, it is called an oblique cone. An object that is shaped like a cone is said to be ‘ conical’.
Sphere: A sphere is a geometrical figure that is perfectly round, 3-dimensional and circular – like a ball. Geometrically, a sphere is defined as the set of all points equidistant from a single point in space. The distance from an outer point to the center of the sphere is the radius(r) and the maximum straight distance from one side of the sphere to another is the diameter (d).
Hemisphere: A hemisphere is what you would call half a sphere if you were to split a sphere down the middle.

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