Yap Cheong Sheng's answer to Noel's Primary 5 Maths Area & Volume Singapore question.

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Yap Cheong Sheng
Yap Cheong Sheng's answer
7 answers (A Helpful Person)
1st
i was super stuck at this question, but writing down everything made it easier. don't forget to 'let': 'letting' really helps to make notation and realizations easier :)