An object in real world has 3 dimensions, width, depth and height. Cube, Cylinder are examples of three dimensional shapes. Our body is also a three dimensional figure. 3 dimensional shapes have surface area and volume. Nets of threee dimensional figures are patterns that can be cut and folded to make the 3 dimensional figures. Surface area of the objects can be calculated by totaling the areas of the parts of the net. For ex. surface area of a rectangular prism with dimensions length (l), width (w) and height (h) = 2 (l x w + l x h + w x h), as it has 3 sets of 2 identical rectangles. Identifying the objects by looking at nets of 3d shapes need visualisation. Use three dimensional shapes worksheets and other resources on this page to learn to visualise and calculate surface areas of the 3d shapes.

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To find the surface area of any shape, you can follow the process described below:

Draw a net of the polyhedron.

Calculate the area of each face.

Add up the area of all the faces.

Nets of a Solid. A geometry net is a 2-dimensional shape that can be folded to form a 3-dimensional shape or a solid. Or a net is a pattern made when the surface of a three-dimensional figure is laid out flat showing each face of the figure. A solid may have different nets.

Some 3D shapes, like cubes and pyramids, can be opened out and unfolded into a flat shape. The unfolded shape is called the net of the solid.

building blocks are often cubes or rectangular prisms. They have six faces, or flat surfaces. Other familiar solid shapes are spheres, which children might recognize as being shaped like balls; cones, like ice cream cones or traffic cones; and cylinders, which are shaped like cans.