a. Given a parallelogram with angles a, b, c. and d. as in Figure 10.90 . describe how angle a is related to the other 3 angles. Your answer should be general, in that it would hold for every parallelogram, not just for the particular parallelogram shown in the figure.
b. Use the delinition of parallelogram and the Parallel Postulate to explain why the relationships you found in part (a) hold.
Figure 10.90 How are the angles related?
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