The stage in the auditorium at Washington Middle School is shaped
like a quadrilateral with each of two
angles measuring 110°, as shown in
the diagram below.
110
1100
Stage
2
In the drawing, 21 is congruent to
22. List the steps in order to find
the degree measure of 21?
1. Divide by 2
II. Find the sum of the given
angles.
III. Find the difference from
360°
III, I, II
O II, 1, 111