In trigonometry [三角学], the gradian [百分度], also known as the gon (from Ancient Greek: γωνία, romanized: gōnía, lit. 'angle'), grad, or grade, is a unit of measurement of an angle, defined as one hundredth of the right angle. In other words, there are 100 gradians in 90 degrees. Measuring angles in gradians is said to employ the centesimal [百分的] system of angular measurement. The unit originated in connection with the French Revolution in France as the grade, along with the metric system, hence it is occasionally referred to as a metric degree.
In the Centesimal System, an angle is measured in grades, minutes and seconds. In this system, a right angle is divided into equal parts and each such part is called a Grade (1g). Again, a grade is divided into equal parts and each such part is called a Centesimal Minute (1'). And a minute is further subdivided into equal parts, each of which is called a Centesimal Second (1").
The following systems of units are used in the measurement of angles:
Gradient in vector calculus is a vector field representing the maximum rate of increase of a scalar field or a multivariate function and the direction of this maximal rate. Gradient may also refer to:
The grade (also called slope, incline, gradient, mainfall, pitch or rise) of a physical feature, landform or constructed line refers to the tangent of the angle of that surface to the horizontal. It is a special case of the slope, where zero indicates horizontality. A larger number indicates higher or steeper degree of "tilt". Often slope is calculated as a ratio of "rise" to "run", or as a fraction ("rise over run") in which run is the horizontal distance (not the distance along the slope) and rise is the vertical distance.
六级/考研单词: comb, revolve, farther, imperial, triangle, integrity, evaluate, curve, incline, physics, construct, horizon, nil, steep, tilt, seldom, fraction, vertical
如果“梯度”改叫“坡度”,想快速下山就走眼前最陡的坡……