check this approach a ^ 2 - b ^ 2 = (a + b) (a - b)

What is the unit for the radius (100 what?)?

I assume the question asks for the unit digit of (a+2) ^ 2.

if unit digit of a ^ 2 is 9 then unit place a should be 3 or 7

if unit digit of (a+1) ^ 2 is 4 then unit place can only be 8

=> unit digit of (a+2) ^ 2 is 1

Hope this helps.

the final remainder (which leads to the tenths decimal value) when divided by 8 will always have a quotient >= 1 (since 8 < 10). On the other hand for 16 it could be >= 0 (since 16 > 10).

So B is sufficient.

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