Priscilla Ng's answer to Jeleena's Primary 6 Maths Geometry Singapore question.

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Priscilla Ng
Priscilla Ng's answer
788 answers (Tutor Details)
Hope the picture helps you to visualize how the problem is solved.

Here is the website for you to try hands-on in building the solid:
https://www.nctm.org/Classroom-Resources/Illuminations/Interactives/Isometric-Drawing-Tool/