Question 914903
She started with {{{ 4.5*8.25 = 37.125 }}}, or
37-1/8 square feet
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Find the area of the circle
{{{ A = pi*r^2 }}}
where {{{ r }}} = the radius
radius = (1/2)*diameter
{{{ r = 3/2 }}} ft
{{{ A = pi*(3/2)^2 }}}
{{{ A = ( 9*pi )/4 }}}
{{{ A = 28.269 / 4 }}}
{{{ A = 7.06725 }}}
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( leftover plywood ) = ( area she started with ) - ( area of circle )
leftover plywood = {{{ 37.125 - 7.06725 }}}
leftover plywood = {{{ 30.05775 }}} square feet
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her friend paid:
( cost per square foot ) x ( square feet left over )
{{{ 1.75*30.05775 = 52.60106 }}}
You can't have fractions of a penny, so her
friend paid $52.60
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Hope this helps