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# Geometry: Understanding Angles

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Angle

### What is the word 'angle' derived from?

Latin word angulus, meaning 'corner'

### What does Euclid define as a plane angle?

The inclination to each other, in a plane, of two lines that meet each other and do not lie straight with respect to each other

### What are angles formed by the intersection of two planes called?

<p>Dihedral angles</p> Signup and view all the answers

### What is the measure conventionally defined as the ratio of a circular arc length to its radius?

<p>Angle of rotation</p> Signup and view all the answers

## Study Notes

### Angles and Planes

• An angle is a figure formed by two rays sharing a common endpoint, which is called the vertex.
• The word 'angle' is derived from the Latin word 'angulus', meaning 'corner'.
• According to Euclid, a plane angle is the inclination of two lines to one another in a plane, which is formed by two lines that meet.
• Angles formed by the intersection of two planes are called dihedral angles.
• The measure of an angle is conventionally defined as the ratio of a circular arc length to its radius.

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## Description

Test your knowledge of angles in Euclidean geometry with this quiz. Explore the concepts of plane angles, dihedral angles, and angles formed by intersecting curves.

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