What angle measures 90 degrees?
Angles in geometry are measured using units called degrees. There are many types of angles, which can be identified by their degree measurement. Using a protractor, a tool similar to a ruler, is the most common way to measure angles.
Answer and Explanation:
An angle that measures exactly 90 degrees is called a right angle.
These angles can be identified by the two rays which meet to form the right angle;...
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Learn more about this topic:
from High School Geometry: Homework Help ResourceChapter 4 / Lesson 17