Unknown number 24

I think the number:

a - is the same as the square area that has the 12th circumfence. What is this number?
b - its half is 7 times bigger than its quarter. Is this the number?

Result

a =  9
b =  28

Solution: b/2 = 7 + b/4

b = 28

b = 28

Calculated by our simple equation calculator.

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