I've been attempting this question and am not sure about part (iii). The mark scheme gives the y-coordinate of the square to be removed as 1, but I am unsure why this is. Why couldn't you take another y-coordinate, say, 1.5?
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Last edited by georgen13; 1 week ago at 20:58. Reason: q
They want the largest value of y for the lamina, so by removing a piece as low as possible, the value of y for the lamina is at the maximum it can be.