# Chapter 4 - Section 4.1 - Properties of a Parallelogram - Exercises - Page 178: 40

When we use a protractor to measure the angle, we should measure an angle that is close to the calculated value $78.7^{\circ}$

#### Work Step by Step

We can calculate the angle $x$ as follows: $tan~x = \frac{opp}{adj}$ $tan~x = \frac{250}{50}$ $tan~x = 5$ $x = tan^{-1}~(5)$ $x = 78.7^{\circ}$ When we use a protractor to measure the angle, we should measure an angle that is close to the calculated value $78.7^{\circ}$

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