Answer
See table
Work Step by Step
We measure the angles of each quadrilateral using a protractor and complete the table:
\begin{array}{|c|c|c|c|c|c|} \hline \text{Quadrilateral} & m\angle A & m\angle B & m\angle C & m\angle D & m\angle A+m\angle B\\ & \text{(degrees)} & \text{(degrees)} & \text{(degrees)} & \text{(degrees)}& +m\angle C+m\angle D\\ \hline a. & 120 & 90 & 92 & 57 & 359\\ \hline b. & 70 & 151 & 50 & 90 & 361\\ \hline c. & 90 & 65 & 60 & 145 & 360 \\ \hline \end{array} The measurement error for each angle is around $\pm 0.5$ degrees.
