Question 1142430
Let {{{ a }}} = the top angle
{{{ 4a + 4a + a = 180 }}}
{{{ 9a = 180 }}}
{{{ a = 20 }}}
{{{ 4a = 80 }}}
The angles are 20 - 80 - 80
---------------------------------
check:
{{{ 20 + 80 + 80 = 180 }}}
OK