Open Question: The measures of the interior angles of a convex decagon are 45 degrees, 60, x, 3x, 7x, and 90 degrees.?
Open Question: Why are alternate interior angles and alternate exterior angles both called "alternate"?

Open Question: Why are alternate interior angles and alternate exterior angles both called "alternate"?

...because they lie on opposite/alterrnate sides of the transversal !

Compare to "same-side" interior angles.

Read your textbook.


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Open Question: What is the size of an interior angle of a regular decagon?