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Calculate B for the figure below
7 mi
4 mi
O 6.28 mi
O 28 mi
25.12 mi
O 12.56 mi
PLEASEEEE HELPPPP
![Calculate B For The Figure Below 7 Mi 4 Mi O 628 Mi O 28 Mi 2512 Mi O 1256 Mi PLEASEEEE HELPPPP class=](https://us-static.z-dn.net/files/d6a/64363d3aa064aa7330198c2d3714d284.png)