Three Dimensional Shapes
In geometry, three-dimensional shapes or 3D shapes are solids that have three dimensions such as length, width and height. Whereas 2d shapes have only two dimensions, i.e. length and width. Examples of three-dimensional objects can be seen in our daily life such as cone-shaped ice cream, cubical box, a ball, etc. Students will come across different 3D shapes models in Maths.
Geometry is one of the practical sections of Mathematics that involves various shapes and sizes of different figures and their properties. Geometry can be divided into two types: plane and solid geometry. Plane geometry deals with flat shapes like lines, curves, polygons, etc., that can be drawn on a piece of paper. On the other hand, solid geometry involves objects of three-dimensional shapes such as cylinders, cubes, spheres, etc. In this article, we are going to learn different 3D shapes models in Maths such as cube, cuboid, cylinder, sphere and so on along with its definitions, properties, formulas and examples in detail.
Table of Contents:
- Three Dimensional Shapes Definition
- Faces, Edges and Vertices
- List of Three Dimensional Shapes
- 3D Shapes Model in Maths
- Surface Area and Volume Formulas
- Video Lessons
- Practice Questions
What are Three-Dimensional Shapes?
Shapes that can be measured in 3 directions are called three-dimensional shapes. These shapes are also called solids. Length, width, and height (or depth or thickness) are the three measurements of three-dimensional shapes. These are the part of three-dimensional geometry. They are different from 2D shapes because they have thickness. Several examples can be found in everyday life. Some of them are:
Solid Shapes in Maths
In Mathematics, the three-dimensional objects having depth, width and height are called solid shapes. Let us consider a few shapes to learn about them. You can find many examples of solid shapes around you, such as a mobile, notebook or almost everything you can see around is a solid shape.
Faces, Edges, and Vertices of Three Dimensional Shapes
Three-dimensional shapes have many attributes, such as vertices, faces, and edges. The flat surfaces of the 3D shapes are called faces. The line segment where two faces meet is called an edge. A vertex is a point where three edges meet.
Also, read: Vertices, Edges and Faces
List of Three-dimensional Shapes
The list of three-dimensional shapes are as follows:
|Three-dimensional Shapes Names:
A cube is a solid or three-dimensional shape which has 6 square faces. The cube has the following properties.
- All edges are equal
- 8 vertices
- 12 edges
- 6 faces
A cuboid is also called a rectangular prism, where the faces of the cuboid are a rectangle in shape. All the angles measure 90 degrees. The cuboid has
- 8 vertices
- 12 edges
- 6 faces
A prism is a 3D shape which consists of two equal ends, flat surfaces or faces, and also has identical cross-section across its length. Since the cross-section looks like a triangle, the prism is generally called a triangular prism. The prism does not have any curve. Also, a prism has
- 6 vertices
- 9 edges
- 5 faces – 2 triangles and 3 rectangles
A pyramid a solid shape, whose outer faces are triangular and meet to a single point on the top. The pyramid base can be of any shape such as triangular, square, quadrilateral or in the shape of any polygon. The most commonly used type of a pyramid is the square pyramid, i.e., it has a square base and four triangular faces. Consider a square pyramid, it has
- 5 vertices
- 8 edges
- 5 faces
A cylinder is defined as a three-dimensional geometrical figure which has two circular bases connected by a curved surface. A cylinder has
- No vertex
- 2 edges
- 2 flat faces – circles
- 1 curved face
A cone is a three-dimensional object or solid, which has a circular base and has a single vertex. The cone is a geometrical figure that decreases smoothly from the circular flat base to the top point called the apex. A cone has
- 1 vertex
- 1 edge
- 1 flat face – circle
- 1 curved face
A sphere is a three-dimensional solid figure which is perfectly round in shapes and every point on its surface is equidistant from the point is called the center. The fixed distance from the center of the sphere is called a radius of the sphere. A sphere has
- No vertex
- No edges
- 1 curved face
Three-dimensional Shapes related Articles
3D Shapes Model in Maths Project
If you know what three-dimensional shapes are, it would be easy for you to build a 3d shapes models in Maths such as projects for constructing a house or a building. This would be easy for the students to make as they can measure the rooms easily. Rest all they need is cardboard, glue, scissors and art supplies to make it look exactly like a mini house or building.
Surface Area and Volume of 3D shapes
The two distinct measures used for defining the 3D shapes are:
- Surface Area
Surface Area is defined as the total area of the surface of the three-dimensional object. It is denoted as “SA”. The surface area is measured in terms of square units. The three different classifications of surface area are defined below. They are:
- Curved Surface Area (CSA) is the area of all the curved regions
- Lateral Surface Area (LSA) is the area of all the curved regions and all the flat surfaces excluding base areas
- Total Surface Area (TSA) is the area of all the surfaces including the base of a 3D object
Volume is defined as the total space occupied by the three-dimensional shape or solid object. The volume is denoted as “V”. It is measured in terms of cubic units.
|Cube||The Surface Area of a Cube = 6a2 square units||The volume of a Cube = a3 cubic units|
|Cuboid||The Surface Area of a Cuboid = 2(lb+bh+lh) Square units||The volume of a Cuboid = lbh Cubic units|
|Cylinder||The Surface Area of a Cylinder = 2πr(h +r) Square units
The curved surface area of a cylinder = 2πrh
|The volume of a Cylinder = πr2 h Cubic units|
|Cone||Surface Area of a Cone = πr(r +√(r2+h2) Square units
Curved surface area of a cone =πrl square units
Slant height of a cone = l = √(r2+h2) units
|Volume of a Cone = ⅓ πr2h Cubic units|
|Cylinder||Surface Area of a Cylinder = 2πr(h +r) Square units
Curved surface area of a cylinder = 2πrh
|Volume of a Cylinder = πr2 h Cubic units|
|Sphere||Curved Surface Area of a Sphere = 2πr² Square units
Total Surface Area of a Sphere = 4πr² Square units
|Volume of a Sphere = 4/3(πr3) cubic units|
|Pyramid||Surface Area of a Pyramid = (Base area) + (1/2) × (Perimeter) × (Slant height) Square units||Volume of a Pyramid = 1/3 × (Base Area) × height Cubic units|
Nets of Solid Shapes
To Know About Nets Of Solid Shapes, Watch The Below Video:
Three Dimensional Shapes Examples (Solved problems)
Find the volume of a cube if its side length is 6 cm.
Given: Side length, a = 6 cm.
We know that the volume of cube = a3 cubic units.
Hence, V = 63 = 216 cm3
Hence, the volume of a cube is 216 cm3.
Find the total surface area of a sphere, whose radius is 3 cm. Use (π = 3.14)
Given: Radius, r = 3 cm.
The formula to calculate the total surface area of a sphere is given by:
TSA of Sphere = 4πr² Square units
TSA of sphere = 4(3.14)(3)2 cm2
TSA of Sphere = 113.04 cm2.
Hence, the total surface area of a sphere is 113.04 cm2.
Find the volume of a cuboid, whose dimensions is 4cm × 6 cm × 12 cm.
Given cuboid dimensions = 4cm × 6 cm × 12 cm
We know that the volume of a cuboid is lbh cubic units.
Hence, Volume of cuboid = (4)(6)(12) cm3.
V = 288 cm3
Practice Question on 3D Shapes Models in Maths
Solve the following problems on 3D shapes:
- Find the volume of a cylinder whose radius is 4 cm and height is 8 cm.
- Find the volume of a cone whose radius is 5 cm and height is 9 cm.
- Find the volume of a pyramid whose base area is 126 cm2 and height is 10 cm.