← 4.4 Common Solids

Surface area of a cuboid

Mathematics · Grade 8 · about 40 minutes

Three different rectangles, each counted twice, and what to do when a face is missing.

Sign in to read this lesson

Lessons are for learners and teachers with an account. Browsing the curriculum — subjects, strands and what each sub-strand covers — stays open to everyone.

  • 7 sections of explanation, worked examples and diagrams
  • 1 practice task with hints and worked answers
  • A quiz that marks itself as you go
  • Your progress kept across every subject you take
Sign in Create an account