Question 935636
The area of the sheet is:
{{{ 36*25 = 900 }}} cm2
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The radius of the buttons is:
{{{ d/2 = 3.5/2 }}}
{{{ d/2 = 1.75 }}} cm
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The area of each button is:
{{{ A = pi*r^2 }}}
{{{ A = 3.141*1.75^2 }}}
{{{ A = 9.619 }}} cm2
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The total area of {{{ 56 }}} buttons is:
{{{ 56*9.619 = 538.682 }}} cm2
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The area left over is:
{{{ 900 - 538.682 = 361.319 }}} cm2