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Well done!
You told me before that Portugal maths dive into trigonometry and calculus even for sixth graders. Does this kind of heuristics feel like a waste of time to you?
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This is a piece of cake, even a sixth grader could ace it.
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20 / 4 = 5 cm
20 - 5 = 15 cm
A = 5 x 15 = 75 cm2