1 degree is 60 minutes (60 ')360 seconds (360 "). The unit of angle is degree, and degree is the unit to measure the size of angle. The symbol is 0. A fillet is divided into 360 equal parts, and each part is defined as 1 degree (1 degree). Angle is a mathematical concept. It can describe the size of the angle, that is, the amount that must be rotated when either of the two intersecting lines overlaps the other intersecting line.

In practical application, the angle of an integer is accurate enough. When more accurate angle values are needed, such as measuring the latitude and longitude of a star or the earth in astronomy, angles can be subdivided into angular minutes and angular seconds: 1 degree is 60 minutes (60'), and 1 degree is 60 seconds (60 ").

For example, 40.1875 = 4011'15 ". In order to be more accurate, the angular seconds are expressed in decimals without adding units.

Angle and radian:

In mathematics, radian is used instead of angle, because the divisibility of 360 is not important to mathematics, and radian is more convenient in mathematics. Angle and radian

The relationship is: 2π radian = 360. Thus 1 ≈ 0.0 174533 radian, 1 radian ≈ 57.29578.

1, the angle is converted into radian formula: radian = angle ÷ 180×π.

2. Formula for converting radian into angle: angle = radian×180÷π.