Standard Mathematics Primary 4 Geometry

Priya is making a model of a triangular prism out of cardboard for her school project. She needs to cut out all the faces and arrange them flat as a net before folding. Which of the following correctly describes the faces in a net of a triangular prism?

A 2 triangles and 3 rectangles
B 2 triangles and 2 rectangles
C 1 triangle and 4 rectangles
D 2 squares and 3 rectangles
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Worked Solution

Step 1: Recall the definition of a triangular prism — it has two congruent triangular bases and three rectangular lateral faces. Step 2: Count all the faces: 2 triangular bases + 3 rectangular side faces = 5 faces in total. Step 3: A net of a triangular prism must contain exactly these 5 faces arranged flat so that they fold up to form the closed solid. Step 4: The correct description is 2 triangles and 3 rectangles. Answer: 2 triangles and 3 rectangles.

Correct answer: 2 triangles and 3 rectangles

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