Surface area of a prism means finding the area of every face and adding them up. Opposite faces match, so you often double an area. This runs on area of a rectangle, doubling, and adding several areas. Warm those up first.
These are words you'll need to already know to follow this lesson — not the new words the lesson teaches. Review each one, its meaning, and the example so the new lesson makes sense from the start.
Level 1 How much flat space is inside a shape.
Example: A side 7 long and 2 wide has an area of 7 × 2 = 14.
Level 1 To make a number twice as big by multiplying it by 2.
Example: To double 15, do 2 × 15 = 30.
Level 1 To put numbers together to find a total.
Example: 20 + 12 + 6 adds up to 38.
Level 1 A flat shape with four straight sides and four square corners.
Example: Each side of a box is a rectangle.
These check the skills you'll need for this lesson — not the new lesson itself. Answer all 3, then press Show my path. No grade — it just suggests where to start.
1. Area of a rectangle 7 long and 2 wide?
2. Double an area of 15. What is 2 × 15?
3. On a box, the top face and the bottom face are…
Vocabulary previewed and basics checked. Time to start the lesson.
Start Lesson 10-4 →