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Supplementary angles have a sum of 180°.
Let's say one of these angles has a measure
. The problem states that its supplemenbt is nine times this, so it has measure 
.
We know that these angles together equal 180°, so we can write
.
We can solve for x.
If x = 18, then the has a measure of
, or 162°.
Let's say one of these angles has a measure
We know that these angles together equal 180°, so we can write
We can solve for x.
If x = 18, then the has a measure of
