Learn Math Vocabulary in English through pictures and videos.

The **language of mathematics** is the system used by a mathematician to communicate mathematical ideas among themselves. This language consists of a substrate of some natural language (for example English) using technical terms and grammatical conventions that are peculiar to mathematical discourse, supplemented by a highly specialized symbolic notation for mathematical formulas.

**Math Vocabulary | Video**

**Math Vocabulary | Pictures**

## How to Say and Write Numbers in English

## “Angles” Vocabulary

*An angle equal to 1/4 turn (90° or π/2 radians) is called a***right angle**. Two lines that form a right angle are said to be normal, orthogonal, or perpendicular.*A pair of angles opposite each other, formed by two intersecting straight lines that form an “X”-like shape, are called***vertical angles**or**opposite angles**or**vertically opposite angles.***Angles larger than a right angle and smaller than a straight angle (between 90° and 180°) are called***obtuse angles**(“obtuse” meaning “blunt”).*An angle equal to 1/2 turn (180° or π radians) is called a***straight angle.***Angles larger than a straight angle but less than 1 turn (between 180° and 360°) are called***reflex angles.***An angle equal to 1 turn (360° or 2π radians) is called a***full angle, complete angle,**or**a perigon.***Angles that are not right angles or a multiple of a right angle are called***oblique angles.***…*

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