what is the circumference of a circle with the diameter of 7cm
\(C=7\pi\\ C=22\ (aprox.)\)
circumference of a circle = \(2\varpi r\)
2*pi*3.5 = 21.9911485751285527
\(2*pi*3.5\)
But if your teacher says you have to take pi=3 then answer will be 21, not 21.9911485
+56 
