Surface Area of Cubes & Rectangular Prisms and Gift Wrap 🎁
The surface area of a 3D shape is equal to the sum of the areas of all the faces (sides) of that shape. A helpful way to think about it is:
surface area = sum of face areas
We can also think about surface area in terms of gifts! The surface area is like the minimum amount of wrapping paper we need to prep a gift for its surprise reveal. 🤩
If we were to unwrap a gift, the amount of wrapping would be equal to the surface area of the object it was covering.
Pick a gift shape to unwrap:
When we “unwrap” a 3D shape, we get what we call a net
. A surface area net shows us the different 2D shapes that make up the faces of the 3D shape.
We can then find the area of each face and then add them all together to find the total surface area.
Surface Area of Cubes & Rectangular Prisms Calculator
Key Steps 🗝 How to Find Surface Area of Cubes and Rectangular Prisms
Step 1. Unwrap the cube.
Step 2. Calculate the area of each part of the net that makes up the cube.
Step 3. Add up the areas of the shapes that make up the cube.
Continue to explore how to find the surface area of cubes and rectangular prisms in more detail ✨.