Can I get some help in this question from geometry?
I will answer one of your questions!!! :)

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(1) Answers

dimasaleh101

1) We know, Circumference = 2πr
If radius is tripled, then, C' = 2π(3r) = 6πr = 3 * 2πr = 3 * C
So, Circumference will also get increased to it's triple value
2) We know, Area = πr²
If radius is doubled, π(2r)² = 4π²
So, Area will increase 4 times to it's intial value
Hope this helps!