Surface area of a cuboid
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Objectives
- Properties of a cuboid.
- Derivation of the formula for total surface area, lateral surface area and volume of a cuboid.
- Understand the concept of open cuboid, closed cuboid.
Estimated Time
40 minutes.
Prerequisites/Instructions, prior preparations, if any
Materials/ Resources needed
Digital: Laptop, geogebra file, projector and a pointer.
Process (How to do the activity)
- Project geogebra file and let children explore a cuboid from all angles by moving the sliders.
- Ask the following questions.
- Developmental Questions:
- What is a solid figure ?
- Name the dimensions of the cuboid.
- Recognise the face of each surface of the cuboid.
- Are all faces congruent ?
- Which of the faces are congruent ?
- What is the formula to find area of a rectangle ?
- To what is the total surface area of a cuboid equal ?
- To what is the lateral surface area of a cuboid equal to ?
- Evaluation:
- What is the formula to find the total surface area of a cuboid ?
- What is the formula to find the lateral surface area of a cuboid ?
- Question Corner:
- What is the area of an open cuboid ?