Unfold a solid into a flat net and add up every face.
Read this first — it covers the idea in plain language with a worked example.
A net is a 3-D shape unfolded so all its faces lie flat. Surface area is the total area of all those faces added together.
A cube has 6 identical square faces. Find the area of one face, then multiply by 6.
Find the surface area of a cube with edge 4 cm.
Tip
Read the problem carefully — sometimes you need all faces, sometimes only the walls (no top or bottom).
Watch the main video, then check the second take if you want another explanation.
Try a worksheet or work through some problems before the quiz.
A couple of questions to make sure this topic stuck. Retake as many times as you want.
Nets & Surface Area
Surface area of a rectangular prism equals the area of all 6 faces added together.
