AC Lim's answer to Amir's Primary 5 Maths Area & Volume Singapore question.

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AC Lim
Ac Lim's answer
12435 answers (A Helpful Person)
1st
Find unshaded area...
= (12×12) + (9×9) + (6×6) - shaded areas
= 144 + 81 + 36 - (½×6×12)
= 225 cm²
Hope this helps