Unknown number 24

I think the number:

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

Final Answer:

a =  9
b =  28

Step-by-step explanation:

o=12 a=(o/4)2=(12/4)2=9
2b=7+4b  b/2=7+b/4  b=28  b=128=28  b=28



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