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16 is 40 because you just need to add 16 to 14 and to 10 which is equal 40
Number 16 is 24. Perimeter is asking to add so you have to add 10 and 14. You add 10 and 14 because it is asking for AB and BC. It would be 40 if it was asking for AB, BC, and AC. Hope it was helpful.