Class 5MathematicsBoxes and Sketches
Surface Area
Surface area = total area of all faces of a 3D shape. Cuboid: SA = 2(lb + bh + lh). Example: 5×3×4 cm cuboid: 2(5×3 + 3×4 + 5×4) = 2(15+12+20) = 2×47 = 94 cm². Cube: SA = 6×side². 4 cm cube: 6×16 = 96 cm². Surface area determines how much paint/wrapping needed. Volume determines how much it holds. Both are important in packaging!
10 examples
Concept check 1
For Class 5 Mathematics, explain or solve a surface area question from the chapter "Boxes and Sketches". Focus on concept check and show the working clearly.
Definition to application 2
For Class 5 Mathematics, explain or solve a surface area question from the chapter "Boxes and Sketches". Focus on definition to application and show the working clearly.
Formula warm-up 3
For Class 5 Mathematics, explain or solve a surface area question from the chapter "Boxes and Sketches". Focus on formula warm-up and show the working clearly.
Reasoning practice 4
For Class 5 Mathematics, explain or solve a surface area question from the chapter "Boxes and Sketches". Focus on reasoning practice and show the working clearly.
Board-style short answer 5
For Class 5 Mathematics, explain or solve a surface area question from the chapter "Boxes and Sketches". Focus on board-style short answer and show the working clearly.
Mistake correction 6
For Class 5 Mathematics, explain or solve a surface area question from the chapter "Boxes and Sketches". Focus on mistake correction and show the working clearly.
Visual interpretation 7
For Class 5 Mathematics, explain or solve a surface area question from the chapter "Boxes and Sketches". Focus on visual interpretation and show the working clearly.
Applied word problem 8
For Class 5 Mathematics, explain or solve a surface area question from the chapter "Boxes and Sketches". Focus on applied word problem and show the working clearly.
Revision challenge 9
For Class 5 Mathematics, explain or solve a surface area question from the chapter "Boxes and Sketches". Focus on revision challenge and show the working clearly.
Exam recap 10
For Class 5 Mathematics, explain or solve a surface area question from the chapter "Boxes and Sketches". Focus on exam recap and show the working clearly.