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3,14 = 3,14 x r^2
3,14/3,14 = r^2
1 = r^2
1=r , d = 2xr = 2x1 =2cm = 20mm (B)
2. 1540 = 22/7 x r^2 x 10
1540 : 22/7 : 10 =r^2
49 = r^2
7=r d= 14 cm (B)