Question

please solve this now​

Answer 1

Answer:

because they are cylindrical

Step-by-step explanation:

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Answer 2

Answer:

$n \times n + 1 \div 2 = 200 \\ n \times n = (200 \times 2) - 1 \\ = 399 \\ \\ \sqrt{399 = 19.97}$

so that cannot be a triangular number