Measurement · JHS3 Mathematics

Lesson notes

Indicator: B9.3.2.1.1 - Identify cuboids and triangular prisms; draw their nets to construct the 3-D shapes and use it to determine the surface area.

By the end of the lesson, learners can:

Identify and sort real-life objects and drawings into cuboids and triangular prisms, stating at least one defining feature of each.
Match given nets to the correct 3-D shape (cuboid or triangular prism) and explain their reasoning.
Draw an accurate net of a cuboid and a triangular prism using given dimensions.
Construct a 3-D shape from a drawn net by cutting and folding.
Calculate the surface area of a cuboid or triangular prism by finding the area of each face on the net and adding the areas together.

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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: B9.3.2.1.1 - Identify cuboids and triangular prisms; draw their nets to construct the 3-D shapes and use it to determine the 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. 205
Transcribed from the official NaCCA publication. Check this page against the source.

E.g.1 Sort out shapes that are triangular prisms and cuboids.

E.g.2 Identify each of the nets below:

A net of…………….. A net of……………..
E.g.3 Measure and find the area of each of the sections in the net and
adding all together to give the surface area.