Question 1047031
Let the unknown angle = {{{ A }}}
The supplement of {{{ A }}} is:
{{{ 180 - A }}}
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given:
{{{ A = ( 180 - A ) + 53 }}}
{{{ A = 233 - A }}}
{{{ 2A = 233 }}}
{{{ A = 116.5 }}} degrees
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check:
Its supplement is:
{{{ 180 - 116.5 = 63.5 }}}
{{{ 116.5 = 63.5 + 53 }}}
{{{ 116.5 = 116.5 }}}
OK