corner piece edge piece interior piece (two straight sides at right angles) (one straight side) (no straight sides).. We treat two shapes as the same if one is a rotation of the other, w[r]
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Questions 26–30 are worth 6, 7, 8, 9 and 10 marks, respectively.
26. Let A be a 2018-digit number which is divisible by 9. Let B be the sum of all digits of A and C be the sum of all digits of B. Find the sum of all possible values of C.
27. The trapezium ABCD has AB = 100, BC = 130, CD = 150 and DA = 120, with right angles at A and D.
Republication, systematic copying, or multiple reproduction of any part of this material is permitted only under license from the Chiuchang Mathematics Foundation. Requests for such p[r]