Question 935636

if a rectangular acrylic sheet is {{{36cm}}} by {{{25cm}}}, then its area is

{{{A=36cm*25cm}}}

{{{A=900cm^2}}}

 if {{{56}}} circular buttons, each of diameter {{{d=3.5cm}}} have been cut out, then radius is {{{d/2=3.5cm/2=1.75cm}}}

and, the area of all buttons is {{{A[1]=56*(1.75cm)^2*pi}}}

{{{A[1]=56*3.0625cm^2*3.14}}}

{{{A[1]=538.51cm^2}}}

the area of remaining sheet is 

{{{A-A[1]=900cm^2-538.51cm^2}}}

{{{A-A[1]=361.49cm^2}}}