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TIMO - 2018 - Grade 8 - Preliminary Round - Paper 4 Question 20

TIMO · TIMO - 2018 - Grade 8 - Preliminary Round - Paper 4

Question 20

How many diagonals does a convex 90-sided polygon have?
  1. 3915
  2. 4005
  3. 8010
  4. 7920