Answered: The exercise is for 3rd grade students…

The exercise is for 3rd grade students and they have not seen anything about angles and especially not at a very advanced level. Besides, the result is as I said: 7.1 centimeters.

Elementary Geometry For College Students, 7e

7th Edition

ISBN:9781337614085

Author:Alexander, Daniel C.; Koeberlein, Geralyn M.

Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.

Chapter10: Analytic Geometry

Section10.5: Equations Of Lines

Problem 47E

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The exercise is for 3rd grade students and they have not seen anything about angles and especially not at a very advanced level.
Besides, the result is as I said: 7.1 centimeters.

Figure in plane geometry formed by two rays or lines that share a common endpoint, called the vertex. The angle is measured in degrees using a protractor. The different types of angles are acute, obtuse, right, straight, and reflex.

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