Rennie Soh's answer to Nicole's Primary 6 Maths Geometry Singapore question.
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Hi Nicole, think your teacher made a mistake. The last +15 should be a +3 (as written in red in your diagram) since the rectangles are overlapping. 15 unit is the TOTAL area of Rectangle R, NOT the unshaded part.
Date Posted:
4 years ago
15u - 4u = 11u, not 9u. And therefore it's a +5 instead of +3
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