Parts of an Angle
The corner point of an angle is called the vertex.
And the two straight sides are called arms / rays.
And the two straight sides are called arms / rays.
Type of Angle Description
An Acute Angle is an angle with angle measure less than 90° (between 0° and 90°).
A Right Angle is an angle that measure 90° exactly.
An Obtuse Angle is an angle with angle measure greater than 90° and less than 180°.
A Straight Angle is an angle that measure 180° exactly.
A Reflex Angle is an angle with angle measure greater than 180° (between 180° and 360°).
A Full Rotation Angle / A Complete Angle is an angle that measure 360° exactly.
Positive and Negative Angles
When measuring from a base line:
a positive angle goes counterclockwise (opposite direction that clocks go).
a negative angle goes clockwise.
- to see acute angle picture, click Acute Angle picture 1 >
- to see acute angle picture, click Acute Angle picture 2 >
- to see obtuse angle picture, click Obtuse Angle picture 1 >
- to see obtuse angle picture, click Obtuse Angle picture 2 >
- to see right angle picture, click Right Angle picture >
- to see straight angle picture, click Straight Angle picture >
Bibliography
https://www.etsy.com/
https://www.mathsisfun.com/
https://www.splashlearn.com/
https://mytutorsource.com/
https://www.shutterstock.com/
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