An Angle That Measures 180 Degrees Is Called What
Angle CEA and angle CEB they are adjacent. They form a straight angle if you look at their outsides so they must be supplementary.
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Each interior angle of a regular polygon of n sides can be calculated using the formula 180n-2n.
. As per the alternate interior angles theorem when a transversal intersects two parallel lines each pair of alternate interior angles are equal. So they must add up to 180 degrees. They form a straight angle right over here.
So the measure of angle CEA plus the measure of angle CEB which is 110 degrees must be equal to 180 degrees.
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