# Unknown number 24

I think the number:

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

a =  9
b =  28

### Step-by-step explanation:

$a=\left(12\mathrm{/}4{\right)}^{2}=9$

b/2 = 7 + b/4

b = 28

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