Measurement · JHS3 Mathematics

Lesson notes

Indicator: B9.3.2.1.2 - Use the net of a cuboid to determine its surface area.

By the end of the lesson, learners can:

Identify the six faces of a cuboid net and group them into three pairs of congruent rectangles.
Draw an accurate net of a cuboid given its length, width and height.
Calculate the total surface area of a cuboid by finding the area of each face on the net and summing them.
Rearrange the face areas into the formula SA = 2lw + 2lh + 2wh and apply it to solve problems.
Solve word problems involving cuboid surface area in practical situations such as packaging and painting.

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Strand: Geometry and Measurement (Strand 3)
Sub-strand: Measurement (3.2)
Content standard: B9.3.2.1 - Derive the formulas for determining the surface area of prisms (i.e. cuboid and triangular prism) and use to solve problems.
Indicator: B9.3.2.1.2 - Use the net of a cuboid to determine its surface area.
Suggested placement: Term 3, Week 1 (Week 25 of the year)
Our suggestion, laid out in curriculum order across three terms of twelve weeks. NaCCA does not fix the week, so follow your school's scheme of learning.
Curriculum reference: Mathematics, Common Core Programme (JHS1-JHS3), 2023, p. 206
Transcribed from the official NaCCA publication. Check this page against the source.

E.g.1 Find the surface area of each of the cuboids