Question 567951
{{{ 36 }}} degrees is {{{ 36/360 = 1/10 }}} of a full circle
Let {{{ C }}} = circumference
The arc length is {{{ 4*pi }}} cm
{{{ 4*pi = (1/10)*C }}}
{{{ C = 40*pi }}}
The formula is:
{{{ C = 2*pi*r }}}
{{{ 40*pi = 2*pi*r }}}
{{{ r = ( 40*pi ) / ( 2*pi ) }}}
{{{ r = 20 }}} cm