Angles are measured using degrees. Angles can be measured in both radians and degrees. When measuring angles in practical geometry, we always measure them in degrees. The symbol ° (degree) represents a degree. One full rotation of the globe is measured by 360 degrees (also written as 360°).
What is a Degree?
A degree is a measuring unit for angles. The degree is not an SI unit, the SI unit for measuring angles is the radian. Angles are generally measured with a protractor in geometry. Mathematical problems generally require the use of a protractor to measure angles.
Angle in Degrees
In mathematics, the measuring unit for an angle is degree. The tool used for measuring an angle is a protector. A complete circle rotates at 360° and angles can be measured at different angles showcasing different degrees such as 30°, 45°, 60°, and so on. There are 360 equal parts to one rotation, each of which is called a degree. We denote a degree with a circle °. For example, 180° means 180 degrees.
Measurements of some important angles
- Right Angle – Right angle measurement is 90 degrees (90°).
- Obtuse Angle – An obtuse angle measurement is greater than 90° and lesser than 180°
- Acute Angle – An obtuse angle measurement is less than 90° and greater than 0°
- Straight Angle – Straight angle measurement is 180°
- Reflex Angle – Reflex angle measurement is greater than 180° and lesser than 360°.
- Complete Angle – Straight angle measurement is 360°