The arc length is. The integral also works with respect to y useful if we happen to know xg y. Arc length is the distance between two points along a section of a curve.
And a part of the circumference is called an Arc.
The Trigonometry of Circles - Cool Math has free online cool math lessons cool math games and fun math activities. The pizza slice is called a Sector. The length of the words may help you remember. An alternative definition of a semicircle is that it is simply an arc - a curved line that is half the circumference of a circle without the straight line linking its ends.