Problem: four circular cardboard pieces , each of radius 7 cm are placed in such a way that each piece touches two other pieces . the area of the space encosed by the four pieces is. four circular cardboard pieces , each of radius 7 cm are placed in such a way that each piece touches two other pieces . the area of the space encosed by the four pieces is 
Options: ['a ) 12', 'b ) 32', 'c ) 42', 'd ) 52', 'e ) 58']
c