In mathematics, solid geometry was the traditional name for the geometry of three-dimensional solids - for practical purposes the kind of space we live in. It was developed following the development of plane geometry. Stereometry deals with the measurements of volumes of various three dimensional solid figures including cylinder, circular cone, truncated cone, sphere, and prisms. (Source: From Wikipedia).
Here we are going to learn about the volume and surface area three dimensional solids.
Formulas to Find the Volume and Surface Area of three Dimensional Solids
Here we are going to see some arithmetic formulas to find the volume and surface area of simple three dimensional solids such as cube, cone, cylinder, and sphere.
Volume of cube = a3 cubic units.
Surface area of a cube = 6a2 square units
Volume of cone = '1/3 pi r^2 h' cubic units.
Surface area of a cone = 'pi r(r + s)' square units.
Volume of cylinder = 'pi r^2 h' cubic units.
Surface area of cylinder = '2 pi r(r + h)' square units
Volume of sphere = '4/3 pi r^3' cubic units.
Surface area of a sphere = '4 pi r^2' square units.
Example Problems to Find the Volume and Surface Area of three Dimensional Solids
Find the volume of a three dimensional solid with all sides equal to 3.5 feet.
A three dimensional solid with equal sides is a cube.
Volume of a cube = a3 cubic units
= 3.5 * 3.5 * 3.5
So, the volume of the given three dimensional shape is 42.88 cubic feet.
Find the volume of the cone, whose radius is 3.5 cm and height is 4.8 cm.
Volume of a cone = '1/3 pi r^2 h' cubic units
= '1/3' * 3.14 * 3.5 * 3.5 * 4.8
So, the volume of the given cone is 61.544 cubic cm.
Find the surface area of a cylinder with radius 4 cm and height 8 cm.
The surface area of a cylinder = '2 pi r(r + h)' square units
= 2 * 3.14 * 4(4 + 8)
= 2 * 3.14 * 4 * 12
The surface area of the given cylinder is 301.44 square cm.
Find the surface area of a sphere, whose radius is 1.5 m.
The surface area of a sphere = '4 pi r^2' square units
= 4 * 3.14 * 1.5 * 1.5
So, the surface area of the given sphere is 28.26 square meter.