Question 1131250
Let {{{ theta }}} = the unknown angle
{{{ 180 - theta }}} = the supplement
{{{ 90 - theta }}} = the complement
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{{{ 180 - theta = 6*( 90 - theta ) }}}
{{{ 180 - theta = 540 - 6*theta }}}
{{{ 5*theta = 540 - 180 }}}
{{{ 5*theta = 360 }}}
{{{ theta = 72 }}} degrees